Release Notes for Build 72.16 of NetScaler 11.0 Release

June 8, 2018|Release notes version: 1.0

This release notes document describes the enhancements and changes, lists the issues that are fixed, and specifies the issues that exist, for the NetScaler release 11.0 Build 72.16. See Release history.

Notes

This release notes document does not include security related fixes. For a list of security related fixes and advisories, see the Citrix security bulletin.

This build includes fixes for the following 4 issues that existed in the previous NetScaler 11.0 release build: 658108, 688274, 689538, 675347.

The known issues section is cumulative. It includes issues newly found in this release, and issues that were not fixed in previous NetScaler 11.0 releases.

The [# XXXXXX] labels under the issue descriptions are internal tracking IDs used by the NetScaler team.

Alarms and events are generated if any VPX instance running on an SDX appliance is either out of service or unreachable at the time of SDX backup. To view the alarms and events about any discrepancy in the backup file, from the NetScaler SDX GUI navigate to Configuration > System > Events/Alarms.

[# 666238]

Support for SDX 26000-100G Platform

This release supports the SDX 26000-100G platform. For more information, see https://docs.citrix.com/en-us/netscaler-hardware-platforms/sdx/hardware-platforms/sdx-26xxx100g.html

[# 703467]

Support for SDX 15000-50G Platform

This release supports the SDX 15000-50G platform.

[# 704960]

Platform

Support for Hardware Platforms

This release now supports the NetScaler MPX 5900 and NetScaler MPX 8900 platforms. For more information, see https://docs.citrix.com/en-us/netscaler/12/ssl/support-for-mpx-5900-8900-platforms.html.

[# 493998, 681106, 694392]

Fixed Issues

The issues that are addressed in Build 72.16.

Admin Partitions

In a rare scenario, the secondary appliance of a high availability setup fails during an HA force sync operation. The appliance fails because of a memory allocation failure in an admin partition.

[# 703522, 690223]

Application Firewall

A NetScaler Application Firewall appliance running release 10.5 build 66.6, 11.0, or 11.1 fails because of a packet-engine crash while applying an AppFirewall policy to the load balancing virtual server.

[# 691211, 692817, 695869, 701193, 691219, 700413]

A NetScaler AppFirewall appliance running release 10.5 build 66.6, 11.0, or 11.1 fails because of a packet-engine crash while applying an AppFirewall policy to the load balancing virtual server.

[# 691219]

If a signature rule is configured on POST body with the content-type “application/xml”, the NetScaler application firewall appliance might not apply the associated rule actions to a traffic even after the rule matches the traffic.

[# 694727]

Application firewall truncates html error page response, if the configured html error page is more than 8 KB in size.

[# 695591]

The error message “Cannot deploy CSS relaxation with empty value” appears when you attempt to deploy CSS learned rules with value type as "$" on a NetScaler application firewall appliance.

[# 695903]

The in-use memory of a NetScaler appliance reaches 90% when the expression match type in signatures along with auto-update causes the memory leak.

After an upgrade, the Form Field Consistency Check blocks content even if the AppFW policy rules are properly configured.

[# 698952]

The NetScaler application firewall allows SQL injection attack if the Content-Type of the HTTP header is modified.

[# 700289]

The leading TCP window size is rounded off when the post body limit is set to 4294967295(2^32-1). The fix ensures that the limit max TCP window set by Application Firewall is 100 MB in non-streaming data and 20 MB for streaming data.

As a workaround, please add the post body limit on profile to values <=512MB, preferably to value 100MB. Also when requests are of larger sizes, please ensure that the profile has streaming enabled. Enable streaming only if backend server is able to accept chunked requests.

[# 708394, 708678, 707955, 708851]

GSLB

When a remote GSLB service is configured with an external monitor on a GSLB site node, the state of this service might become inconsistent across packet engines, because of core-to-core message failures. In that case, the NetScaler appliance might generate incorrect replies to GSLB domain queries.

[# 658108, 679822, 692324, 692737, 695765, 708994]

If a large number of GSLB services are configured, a NetScaler appliance might fail to send MEP updates for some of the services if the TCP window is not available. The unavailability of TCP window can result in inconsistencies in the states of the GSLB services between GSLB sites.

[# 700614, 701735, 702307, 693765, 710204, 710088]

Metrics exchange protocol (MEP) between GSLB sites might flap in some cases if you enable the Secure option on the remote procedure call (RPC) node.

[# 707182, 707355, 709032, 708973, 710176]

Integrated Caching

The integrated cache does not have enough memory to accommodate the policy updates required when all policies bound to a content group have to be updated because of a change in the cache configuration.

[# 675025, 675504]

If the response from the Integrated Caching (IC) module has trailing spaces in the content-length header, the HTTP/2 connection times out.

[# 688274]

A NetScaler appliance might crash when stored static objects cause the buffer to overflow and overwrite the pointer to the adjacent buffer.

On the MPX 5900/8900 and SDX 8900 platforms memory allocation fails in some partitions when the memory allocated from one partition is freed in another partition. This results in incorrect memory accounting across partitions causing memory allocation failures.

[# 697089, 707041]

System

If you collect a packet trace with '-capsslkeys' option enabled, all the keys captured in the nstrace.sslkeys file are zeros. The issue is observed only on NetScaler MPX 5900/8900, MPX 26000-100G, and MPX 15000-50G platforms.

[# 707793]

User Interface

In a cluster setup, the “bind vlan” command and the management connection to the NetScaler appliance might fail if the length of both IP address and subnet mask is 15 characters (including the decimal.)

For example, bind vlan 100 192.168.250.196 255.255.255.220

[# 699032, 702822]

In a cluster deployment, you cannot set or reset the rsskey on each node.

[# 701078]

Known Issues

The issues that exist in Build 72.16.

AAA-TM

The NetScaler implementation of Kerberos does not fully implement the ktutil functionality. While this does not affect Kerberos authentication, it restricts some administrative tasks, such as the ability to merge keytab files.

Despite binding loginSchema policies to AAA virtual server, an administrator is able to bind Classic authentication policies. However, these are not used unless authentication policies are advanced.

[# 631362]

A NetScaler appliance configured for NetScaler AAA with LDAP over SSL can become unresponsive when the LDAP server is very slow to respond to requests. At this point, the packet engine is unable to process anymore authentication requests.

[# 660065, 674005]

In rare scenarios, response cookie from OWA 2013 server is not greater than 70 bytes when the NetScaler appliance is configured with Forms Based SSO. Hence, length check for cookie value in success-rule configured in Forms SSO action on the NetScaler appliance needs to be updated with an appropriate value.

[# 676450]

If forms based Single Sign-On (SSO) is configured for Outlook Web Access (OWA) 2013 servers, the "successRule" configured in the forms SSO action must be corrected, because the server sends 64 byte cookie upon successful SSO.

[# 681730]

The back end is not accessible through a clientless VPN (CVPN). The issue occurs when SSO is ON, the proxy is specified in a traffic action, and the back-end credentials are different from the logon credentials.

Workaround:

Create a traffic policy based on back-end URL and create a trafficAction with SSO OFF and No Proxy. The backend should be accessible.

[# 689153]

Admin Partitions

After adding an admin partition, make sure you save the configurations on the default partition. Otherwise, the partition setup configurations will be lost upon system restart.

[# 493668, 516396]

RPCSVR services cannot be configured in admin partitions.

[# 498477]

Admin partitions are not supported on FIPS appliances, but you can nonetheless create them. You are advised against creating admin partitions on a FIPS appliance, because they will not function properly.

[# 517145]

The amount of integrated cache (IC) memory allotted to an admin partition cannot be reduced.

For example, if the IC memory of an admin partition is 10 GB, you cannot reduce it to 8 GB. The memory limit can, however, be increased.

[# 568106, 570578]

In a non-default partition, if the network traffic exceeds the partition bandwidth limit, the FTP control connection fails but the data connection remains established.

[# 620673]

The following two issues can occur if you add an external group as a system group on a NetScaler appliance and use the "set system group" command to configure the prompt string and timeout parameters at the system group level:

1. Session timeout-When a user from an external group logs on to the NetScaler command line interface (CLI), the session timeout set for the group is not applicable to sessions in the default and non-default partitions. However, if you configure the timeout parameter by using the "set system parameter" or "set cli mode -timeout <seconds>" command, the session times out as specified.

2. Prompt string missing-When a user from an external group logs on to the NetScaler command line interface (CLI), the prompt string does not appear in the default and non-default partitions. For example, in a default partition, instead of "<pstring>" only ">" appears, and in a non-default partition, instead of "<pstring-partitionname>" only "partitionname>" appears.

However, if you set the prompt string by using the "set system parameter" or "set cli prompt" command, the prompt string is displayed. For example, cliprompt> appears in a default partition, and cliprompt-partitionname> appears in a non-default partition

[# 632193, 694306]

The following two issues can occur if you add an external group as a system group on a NetScaler appliance and use the "set system group" command to configure the prompt string and timeout parameters at the system group level:

1. Session timeout-When a user from an external group logs on to the NetScaler command line interface (CLI), the session timeout set for the group is not applicable to sessions in the default and non-default partitions. However, if you configure the timeout parameter by using the "set system parameter" or "set cli mode -timeout <seconds>" commands, the session times out as specified.

2. Prompt string missing-When a user from an external group logs on to the NetScaler command line interface (CLI), the prompt string does not appear in the default and non-default partitions. For example, in a default partition, instead of "<pstring>" only ">" appears, and in a non-default partition, instead of "<pstring-partitionname>" only "partitionname>" appears.

However, if you set the prompt string by using the "set system parameter" or "set cli prompt" commands, the prompt string is displayed. For example, cliprompt> appears in a default partition, and cliprompt-partitionname> appears in a non-default partition.

[# 632460]

AppFlow

If a NetScaler high-availability failover occurs when ICA AppFlow is enabled, the session reliability feature will now restore the session. This capability is currently disabled by default and configurable via CLI. The CLI command to enable/disable the feature is

set ica parameter EnableSRonHAFailover YES/NO

[# 456218, 438710, 547601, 620411, 636955]

Application Firewall

The application firewall has memory limitations on the size of a WSDL that can be imported into the NetScaler appliance. The import operation might fail if the size of the WSDL file exceeds the allocated memory.

[# 349504]

If the server sends less data than the amount specified in the Content-length header, the NetScaler application firewall might send a 9845 response and reset the connection.

[# 506653]

The application firewall graphical user interface might display a warning when the Qualys signature file is uploaded to the NetScaler appliance. The transformation program that reads the input file is treating a warning message as an error.

[# 547282]

The cookie consistency behavior changed in release 11.0. In earlier releases, the cookie consistency check invokes sessionization. The cookies are stored in the session and signed. A "wlt_" suffix is appended to transient cookies and a "wlf_" suffix is appended to the persistent cookies before they are forwarded to the client. Even if the client does not return these signed wlf/wlt cookies, the application firewall uses the cookies stored in the session to perform the cookie consistency check.

In release 11.0, the cookie consistency check is sessionless. The application firewall now adds a cookie that is a hash of all the cookies tracked by the application firewall. If this hash cookie or any other tracked cookie is missing or tampered with, the application firewall strips the cookies before forwarding the request to the back end server and triggers a cookie-consistency violation. The server treats the request as a new request and sends new Set-Cookie header(s).

[# 571943]

On a NetScaler appliance running release 11.0 or later, the web application firewall does not always function as expected if the DefaultCharset in a profile is not specified correctly. If a request does not have a content-type header, the WAF uses the DefaultCharset specified in a profile.

[# 624978]

When XML output of an IBM AppScan report is imported into NetScaler, it shows zero entries if the report is based on version 2.2 of the IBM AppScan schema. Citrix supports the 2.0 schema, but must acquire information about version 2.2 of the IBM AppScan schema in order to solve this problem.

[# 626154]

The information that the GUI displays for the application firewall web services interoperability (WSI) check does not say that it is a prerequisite and cannot be disabled.

[# 650789, 650317, 658472]

If you upgrade a NetScaler appliance in a high availability (HA) setup from version 10.5.56.15 to version 11.1.51.1901 and skip 250 rules with active traffic, the GUI or CLI displays a "failed to skip some rules" error message and an operation time-out error message.

Workaround: Turn off the Learning feature when skipping learned rules.

[# 671807]

Application Firewall port information about open ports, such as port 443, is not suppressed. It can therefore be detected by port scan tools such as NMAP in targeted hacker attacks.

[# 674864]

The IP address of a content switching virtual server cannot be accessed after an upgrade from a previous release to the current release. The POST request results in a 302 redirect error.

If request contains more than 15 headers with same name, AppFw responds with 302 response.

[# 710534]

CloudBridge

RADIUS/TACACS remote server auditing does not work.

[# 529380]

Clustering

When Layer 2 mode and MBF are enabled in a cluster deployment, access to * 80 services can fail intermittently.

[# 479899]

When a node is removed from a layer 3 cluster, IPv6 SNIP addresses and routes are being erroneously cleared from the appliance. IPv4 SNIP addresses and routes are not affected.

[# 542693]

When a cluster is connected to more than one upstream router:

- When Autonomous Systems (AS) OVERRIDE is not configured on the upstream router, spare nodes will learn VIP routes from one of the routers, but they will be dropped because the path contains its own AS to prevent loop formation.

- When AS OVERRIDE is configured on any upstream router for cluster neighbors, the upstream router changes the AS path in VIP to its own AS while sending updates to cluster neighbors. Spare nodes do not detect a loop and learnt VIP routes are advertised to other routers.

Spare nodes will not advertise their configured VIP routes but there is no such restriction on BGP learned routes.

[# 547749]

When WIonNS is deployed in a cluster setup, an error occurs if you change the IP address of the WI service to point to the IP address of the cluster configuration coordinator.

[# 582801]

When WIonNS is deployed in a cluster setup, an error occurs when you rename a service that points to the IP address of the cluster configuration coordinator.

[# 583424]

GSLB

If you rename a server associated with a GSLB service and then run the sync gslb command, the GSLB configuration might not synchronize to the other GSLB sites.

Workaround:

Manually update the server name on the other GSLB sites.

[# 511994]

In a typical GSLB deployment, when internal user logon is disabled, GSLB auto sync uses SSH keys to synchronize the configuration. In a partitioned environment, however, GSLB auto sync cannot use SSH keys to synchronize the configuration across the GSLB sites.

Workaround: To use GSLB auto sync in partitioned environment, enable internal user logon and make sure that the partition user name is the same at the local and remote GSLB sites.

[# 625997]

Gateway Insight

Gateway Insight does not report authentication based failures unless the enableEnhancedAuthFeedback parameter is ENABLED in the AAA parameter settings on the NetScaler appliance.

> set aaa parameter enableEnhancedAuthFeedback YES

[# 628266]

High Availability

If you upgrade a NetScaler appliance in a high availability (HA) setup to the latest build of the same release, HA synchronization and command propagation are disabled during the upgrade process. However, after both the appliances are upgraded to the same NetScaler software version, HA synchronization and command propagation are enabled automatically.

[# 611197]

Integrated Caching

After an upgrade, the content acceleration feature is not supported.

[# 597415]

Load Balancing

The NetScaler appliance does not support an outbind operation. That is, the appliance does not support an operation in which the message center initiates an SMPP session to an ESME.

[# 500169]

When the results of the "show lb monitor" command are displayed, the numbering of the user-defined monitors restarts from 1 instead of continuing the numbering from the list of built-in monitors.

[# 511222]

If a NetScaler appliance sending a DNSSEC negative response over UDP is not able to include the required records (for example, SOA, NSECs, and RRSIG records) in the Authority section, the appliance might send a truncated response in the wrong packet format.

[# 540965]

A subscriber cannot initiate more than eight simultaneous sessions.

[# 568052]

IPV6 addresses are trimmed when data is retrieved from the packet engine because the prefix length variable is unset during the GET operation.

[# 573463]

After a high availability failover, Web Interface on NetScaler displays "State Error" if you try to launch an application.

[# 630435]

The NetScaler appliance is unable to reuse an existing probe connection if an HTTP wildcard load balancing virtual server is configured in MAC mode with use source IP (USIP) mode enabled and the Use Proxy Port option turned off. As a result, the connection fails and client the receives a TCP reset.

[# 632872]

If a service group member is assigned a wildcard port (port *), the monitor details for that service group member can be viewed from the Monitor Details page.

[# 671729]

NetScaler CLI

When you use the Net::SSH::Perl library to connect to the NetScaler appliance, and run a command with an argument that has an @ character, an error message reports that the argument does not exist.

For example, an error message appears if you use the @ character in the tacacsSecret parameter of the following command:

- If you use the Net::SSH::Perl library, include double quotes around the command when calling $ssh->cmd().

- Use the Net::Telnet library.

- Use the Net::SSH::Expect library.

[# 346066]

NetScaler GUI

An interface does not appear as tagged or untagged in the network visualizer.

[# 540980]

You cannot upgrade to NetScaler release 11 from the following builds by using the Upgrade Wizard of the NetScaler GUI:

- All builds of NetScaler 9.3

- All builds of NetScaler 10.1

- Any build before Build 57.x of NetScaler 10.5

Workaround: Use the command line interface to upgrade the NetScaler appliance.

[# 563410]

In Security Insight, the Search functionality in Application Summary table does not work.

[# 630276]

The NetScaler dashboard displays very high counter values for Client side TCP connections in the Open state.

[# 653255]

NetScaler Gateway

Active user sessions GUI view shows Client IP as 0.0.0.0 and Server IP as 0.0.0.0 in the first row of each active user session.

[# 447670, 504936, 521963, 571041, 585030, 586840]

The VPN plug-in resets the tunneled TCP connection if either party tries to close the connection by sending a FIN packet.

[# 495596]

The ICA-Proxy Session Timeout Termination does not work if the app is launched after the authentication session has timed out. If the session times out, or is removed before ICA file is launched, this feature does not apply.

[# 538237]

When Unified Gateway is deployed with seamless SSO enabled for virtual server authentication, then the authentication servers and policy realms bound at the authentication virtual server will be ignored. Instead, those authentication policies at Gateway are utilized for authentication. Authentication policies at the authentication virtual server are used when step-up authentication is configured using authentication profiles. Increasing the authentication profile's "authentication level" is the method used to step-up authentication.

[# 540526]

A seamless Single Sign-On (SSO) to the same URL domain fails when a plug-in is launched in native mode.

[# 544325]

The install files (JRE and WF package) cannot be synced between the nodes.

Workaround: The install files (JRE and WF package) must be present in all the NetScaler appliances and must be in the same location.

[# 547742]

The NetScaler AAA daemon can fail during authentication. The "kevent: errno =12" error message is displayed under stress conditions when the RADIUS user accounting is turned on. The failure is due to the system limit is reached with respect to timers.

Workaround: Increase the system limit for the timers.

[# 551286]

The NetScaler EULA feature does not work when certificate authentication is configured. EULA works fine with all other authentication types on NetScaler Gateway.

[# 556111]

When customizing a portal theme according to older processes (for example using the "set vpn parameter -UITHEME CUSTOM" command), the administrator needs to copy the CSS files in the NetScaler shell. Because of the design changes for Portal customization in NetScaler Gateway 11.0, copying the CSS files is required. The steps described in the documentation page at the following location are incorrect:

The previous Step 5 is not required in NetScaler Gateway 11.0. Once changes are made to one appliance, they propagate to all appliances in HA or cluster configurations.

[# 556317]

The NetScaler Gateway client plug-ins will not decouple immediately for previously installed clients after the "Show VPN Plugin-in icon with Receiver" option is enabled. Users have to exit the plugin process and restart the plug-in to complete the decoupling.

[# 558799, 612374]

If a user adds multiple personal bookmarks with the same URL or fileshare address, but each bookmark has a different name, deleting one bookmark will delete all of the bookmarks with the same address.

[# 558903, 689421]

The logo does not appear on the home page.

[# 566003]

When the icon decoupling feature is enabled, the NetScaler Gateway plugin terminates upon a user issuing the quit command in the Citrix Receiver application.

[# 566871]

When using the GUI wizard to install the WebFront package in an HA setup, files selected from the local machine are uploaded to /var/ folder on the primary, but they are not uploaded to the secondary. The command fails on the secondary, and the package is not installed on the secondary.

Workaround: Manually copy the /var/ folder to the secondary node.

[# 568078]

WebFront does not work with StoreFront 3.0. WebFront relies on the NPAPI for interaction with Receiver.

[# 568476]

Customized pages are not loaded successfully in Internet Explorer. This is a known limitation of the browser. To get the customized page in IE, open developer tools by pressing F12. Browse to the NetScaler Gateway URL, and access the customized WebFront site. Customized pages are successfully loaded in Chrome.

[# 570161]

The NetScaler Gateway URL cannot be added to a Store with Receiver for Windows if only the SHA 384 cipher is enabled in the Receiver OS.

[# 571340]

Certificate based authentication fails for devices running Android versions earlier than 5.0. This is applicable if only TLS v1.2 is enabled on the server.

[# 572098]

Two-Factor OFF and user-name extraction do not work when SSL renegotiation is enabled.

[# 572598]

On the Unified Gateway Dashboard, the ICA sessions counter increases when a Full VPN session is established. Although the ICA sessions counter is not configured to collect ICA data, the ICA sessions counter increases.

[# 573301]

The NetScaler Gateway Client icon in Launchpad is not updated with the new client installation. Launchpad continues to show the previous Black Lock icon even though the new Blue Lock icon is shown elsewhere in the Finder.

Workaround - Clear the Finder's icon cache as described in the following article: http://apple.stackexchange.com/questions/151549/symbolic-link-icons-dont-update (requires reboot)

OR

Modify the application alias name in /Applications/Citrix by adding a few spaces (minimum two).

[# 573907]

The NetScaler appliance is not able to connect a Mac computer to the VPN if only SSLv2 is enabled.

[# 574149]

When set in the authentication profile of a load balancing virtual server that is behind a Unified Gateway, the authentication domain parameter causes single sign-on to fail when the authentication is performed by a traffic manager in a different traffic domain.

[# 574194]

During logon, the icon present in the dock is changed to the previous version's icon. After the logon process is finished, the icon changes to the new icon.

Workaround: Quit the plug-in and restart it. The new icon shows normally during the logon process.

[# 574428]

SSL renegotiation of a connection with a device running an Android software version earlier than 5.0 fails if TLS 1.2 is enabled on the appliance running NetScaler Gateway.

[# 574640]

A selected certificate does not get saved when SSL renegotiation with two-factor authentication is enabled. The certificate does get saved when certificate authentication is enabled.

[# 574649]

On Android 4.4.2 devices, after frequent network changes, the VPN session might disconnect, and establishing a new VPN session requires restarting the device. Upgrading the Android version resolves the problem.

[# 575105]

If Citrix Receiver has Icon Decoupling set to ON, the NetScaler Gateway options in the menu do not function. This is an expected behavior. Use the VPN plug-in icon to enable Gateway options.

[# 575334]

Endpoint analysis (EPA) does not start a security scan on the user's device, and the VPN session does not launch with the proxy configured on a Chrome browser.

[# 575527]

The wizard does not support the creation of two Intranet Application type seamless SSO URLs using same LB with different site relative string.

[# 576055]

Portal Customization: Customization changes take up to 120 seconds to appear in the browser, because the integrated caching feature polls for updated gateway resources every 120 seconds.

[# 579923]

Once the Unified Gateway wizard completes, it does not enable the SSO for the session action, bound to the newly created VPN virtual server. Also, the NT Domain is not set. Manually, go to the session action and configure both, the SSO parameter and the NT Domain to achieve Single Sign-on.

[# 582771]

If Pre-Auth EPA is configured and the EPA Plugin is installed, the NPAPI prompts to "Launch Application" before the VPN Plugin is installed. First, download the VPN Plugin, then launch the application.

[# 583435]

The following XM wizard names: _XM_<VIP_IP> should be reserved. These names should not be re-used for additional configuration entities. If the same convention is re-used, the edit/delete of the XM wizard could delete the configuration; even though, it was not pushed by the wizard.

[# 588178, 610159]

If you create a new password that does NOT meet the minimum requirements, or reuse a recent password, an error message states: Password Expired. Please Enter a new Password.

The error message should say: Could not update your password.

The password must meet the length, complexity, and history requirements of the domain.

This issue only occurs if more than one policy is bound on the Gateway, in cascading format. If one of the policies is removed, the correct error message appears.

[# 588354]

When logging on from Chrome (with NPAPI disabled) while a plug-in is installed (the old plugin that doesn't know the new custom URL implementation) in the machine and is not running, you are prompted to Download instead of auto-upgrade.

[# 589387]

In a Unified Gateway deployment, if the first policy that's configured in an authentication cascade is SAML, the user is taken to the NetScaler logon page instead of to SAML IDP. Redirect to SAML IDP happens after authentication on NetScaler fails. To redirect the user to SAML IDP, the administrator must configure a load balancing virtual server with a SAML configuration similar to that of a classic AAA-TM deployment.

[# 594043]

When Unified-Gateway is deployed with GSLB configured with sitePersistence as ConnectionProxy, access to published applications with -ssotype selfauth does not work when the connection is proxied from one site to another.

[# 599435]

If a VPN virtual server is bound as the default virtual server to a content switching (CS) virtual server, the "show VPN virtual server" command does not display the details of the CS virtual server to which the VPN virtual server is bound.

[# 600205]

The global settings for the graphical user interface are not shown correctly.

[# 603701]

If NetScaler Gateway is configured for pre-authentication end point analysis and has client-certificate authentication policies, policies using the REQ.SSL.CLIENT.CERT expression does not evaluate to true.

[# 604270]

If an End User License Agreement (EULA) is bound to the VPN virtual server, the EULA checkbox does not appear if nFactor authentication is enabled for NetScaler Gateway.

[# 615334]

You cannot configure the portal theme for AAA authentication unless the SSLVPN is also enabled for portal theme configuration.

[# 621084, 622825]

If nfactor policies are bound to the AAA virtual server, the logon page of the virtual server is not displayed correctly by an Internet Explorer browser on a Windows mobile device.

[# 621962]

In a cluster setup, the "show bindings" command does not display Negotiate type authentication policies.

[# 627652]

Portal Theme support for AAA TM is not available in admin partitions.

[# 641160]

Even with DNS Views configured, the DNS Views feature fails to invoke the NetScaler appliance.

[# 643222]

After the preauthentication EPA scan completes, the cursor does not return to the index page.

[# 644385]

If FIPS mode is enabled and a SAML operation involving certificate-key structure is performed, the NetScaler appliance dumps core memory and restarts because it references inaccessible memory in the certificate-key structure.

[# 645906, 652648]

An error message appears when a user logs off of a Storefront session, if Gateway logon uses SAML based authentication for ICA Proxy mode.

Workaround: Log off by closing the browser.

[# 646706]

RDP Proxy functionality does not work with Windows 2008 servers running an OS earlier than Windows 2008 R2.

[# 653773]

In some cases, DNE Drivers used for NetScaler Gateway VPN plugin negatively impacts the download speed.

[# 697536]

After upgrading the NetScaler Gateway appliance to release 11.x or later, users might see a blank page upon log on. The blank page appears because the browser serves some of the files from its own cache, instead of requesting all the files from the upgraded appliance.

Workaround: Clear the browser cache.

[# 698839]

NetScaler Insight Center

When Web Insight displays URL records, the maximum size of a URL is limited to 1472 bytes.

[# 500108]

If you have configured the ICA session timeout value to a high value, say 10 minutes or more, and there is no traffic flow from the NetScaler appliances, neither the timeline chart nor the tabular chart displays any data. However, the Active sessions and Active Desktops columns display the data until the ICA session timeout occurs.

[# 536056]

The current-connection details displayed on the NetScaler Insight Center dashboard have a latency of about 2 minutes.

[# 536696]

In NetScaler Insight Center, some countries are not displayed on the Google geo chart.

[# 537003]

In NetScaler Insight Center, the Google geo chart sometimes does not display all regions.

[# 537007]

If you export CSV files of WAN Insight reports, many of the fields in the CSV files might be empty.

[# 547380]

If you upgrade NetScaler Insight Center to release 10.5, build 55.8xxx.e, the compression ratio values are displayed as -NA-.

[# 554960]

Insight Agent should only be added after configuring and deploying Insight DB Cluster.

[# 570619]

NetScaler Insight Center does not report an application-launch failure caused by a user trying to launch an application or desktop to which the user does not have access.

[# 609604]

Gateway Insight displays the Total Byte count as 0 for remote users who have logged on to the NetScaler Gateway appliance but have not launched any application.

[# 617432]

NetScaler SDX Appliance

If you configure Jumbo MTU with MTU greater than 1500 on an interface which is used by cluster nodes or instances on NetScaler SDX, the management service does not display any error and also the Jumbo MTU functionality does not work.

[# 564207]

If you are upgrading NetScaler SDX 11.0 beta to NetScaler SDX 11.0 GA, then the information displayed on the screen is not proper. This does not affect the upgrade process.

[# 572088]

The default setting for auto-negotiation is OFF, which causes an error if you configure the interface from the Management Service.

[# 598688]

When you create or delete a 10G LACP or static channel, transmission stalls on the member interfaces of the channel, and therefore those interfaces stop processing traffic.

Workaround: Delete the 10G LACP/static channel that has this issue and create it again.

[# 600152, 697276, 704954]

Modifying interface operations from the Management Service is not supported with Cisco BD qsfp type.

[# 634273]

LR channel MTU settings are not supported in the Management Service. You must set the MTU settings in the virtual machine.

[# 646977, 640003]

The NICs of a 14xxx 40G or 25xxx 40G NetScaler SDX appliance are not shown under Configuration > System > Interfaces if, after a factory reset, you use the Platform Upgrade option in the Management Service to upgrade the appliance to NetScaler SDX release 10.5 or 11.1 with 5.04 firmware.

[# 663206, 659913]

The current software driver for 1G ports does not support hot-swap capability for 1G SFP transceivers on NetScaler SDX 115xx models.

Workaround: After replacing the 1G SFP transceiver, reset the interface from Management Service. If the issue still persists, restart the appliance.

[# 668696]

When the SDX appliance shuts down, the following message might appear.

After an SDX appliance restarts, the LCD panel that shows the SDX model number goes dark for a minute and then turns back on.

[# 705170]

During shutdown of the SDX appliance, following messages might appear on the console.

mdadm: Couldn't open /dev/md/d1: No such file or directory

mdadm: Couldn't open /dev/md/d2: No such file or directory

mdadm: Couldn't open /dev/md/d3: No such file or directory

These messages are harmless and can be ignored.

[# 706870]

The virtual router ID (VRID) configuration on a static or a link aggregation control protocol (LACP) channel does not work on SDX 26000 and SDX 15000-50G platforms.

[# 709182]

NetScaler VPX Appliance

The NetScaler VPX appliances are now supported on VMware ESX server version 6.0.

[# 592395]

Untagged packets are allowed to pass through an SRIOV VF interface (Intel 82599 NIC) if the VMWare vCenter 6.0 Distributed Virtual Switch (DVS) is used to configure the VLAN trunk mode.

[# 616044]

Traffic might not pass through an SRIOV interface if you use the VMWare vCenter 6.0 Distributed Virtual Switch (DVS) to reconfigure a VLAN trunk policy.

This is a known issue with VMWare vCenter 6.0. Please contact VMWare support for possible workarounds.

[# 622392]

In an ESX environment, the Interface HAMON Configuration option is not available in the NetScaler GUI.

[# 641498]

For IPv6 or LACP support, promiscuous mode must be enabled for VMXNET3 interfaces at the ESX Hypervisor.

[# 641748]

Networking

In an active-active high availability configuration using Virtual Router Redundancy Protocol (VRRP) protocol, a ping to a virtual IP address (VIP) might fail from a node that is a backup node for this VIP address.

[# 485260]

In some cases of FTP data connections, the NetScaler appliance performs only NAT operation and not TCP processing on the packets for TCP MSS negotiation. As a result, the optimal interface MTU is not set for the connection. This incorrect MTU setting results in fragmentation of packets and impacts CPU performance.

[# 485678]

A TCP connection involved in INAT times out at 120 seconds, regardless of what global timeout value you set for TCP client and server connections. For example, the connection times out at 120 seconds even after you run the following command:

set ns timeout -anyTcpClient 50 -anyTcpServer 50

[# 569874]

If an interface and an IP address are bound to a VLAN, binding them to another VLAN fails with the following error message: "ERROR: Either the subnet is not directly connected or subnet already bound to another VLAN." The interface is unbound from its current VLAN and gets bound to the native VLAN.

[# 643341]

During a force sync operation in a cluster deployment, built-in compression policies fail on nodes because the nodes ignore the "Resource already exists" error for these built-in policies.

[# 648182]

Adding an extended ACL/extended ACL6/PBR/PBR6 rule fails if the rule has the same set of conditions as that of a removed extended ACL/extended ACL6/PBR/PBR6 rule.

[# 699886]

Platform

If you add an NTP time server by specifying the server name (host name), and the ns.conf file is very large, the result is a race condition in which the NTP daemon (NTPD) is started before host name services are ready.

Workaround: Do one of the following:

-Restart the NTP daemon after starting the NetScaler appliance.

-Add the NTP server by specifying the IP address of the server instead of specifying the host name.

[# 573306]

In an Openstack Environment, if a custom flavor with an Ephemeral Disk of size of less than 8GB is used to a start a NetScaler VPX or Cisco Nexus 1000v instance, the config drive is not attached to the instance.

[# 578366]

SSL

If you try to add a certificate bundle with the complete path to a certificate-bundle file, an error message appears. For example,

Even though the clientAuthUseBoundCAChain parameter can be enabled and disabled in the back-end profile, it is supported only in the front-end profile.

[# 554782]

FIPS keys that are created on firmware version 2.2 are lost after you downgrade to firmware version 1.1.

Workaround: Export the FIPS keys before you downgrade the firmware. Import the FIPS keys after the downgrade.

[# 559796]

Server Name Indication (SNI) is not supported on a DTLS virtual server. However, if you enable SNI on a DTLS virtual server, an appropriate error message does not appear.

[# 572429]

If you add or remove an HSM key, the following error message appears. However, the key is added or removed successfully.

ERROR: Internal error while adding HSM key.

[# 577552]

If you use the add crl command in release 9.3 to add a certificate revocation list (CRL) with refresh enabled, and you don't specify a method, the add crl command returns an error after an upgrade to a later release. Unlike 9.3, later releases do not have a default method.

[# 604061]

The number of SSL cards that are UP is not displayed for non-default partitions. Because SSL cards are shared between the default partition and the non-default partitions, the total number of SSL cards that are UP in all the non-default partitions is equal to the number of cards that are UP in the default partition.

[# 628914]

On the CLIP node of a NetScaler cluster, a blank value appears in the Client Cert Required field when you run the sh ssl service nshttps-127.0.0.1-443 command, even though client authentication is enabled on the internal services.

[# 661950]

The SSL entities to which an SSL profile is bound do not appear when you run the show ssl profile <Default-Profile> command on a cluster IP (CLIP) address.

Workaround: You can view the bound entities from the NetScaler IP (NSIP) address.

[# 673458, 689516]

If you set a parameter in the older type of SSL profile, the change is not reflected on the cluster IP (CLIP) address. Saving the configuration and restarting, or forcing a cluster sync, then causes a loss in configuration.

[# 689072]

SSL classic policy expressions are not honored.

Workaround: Use SSL default policy expressions.

[# 692137]

Security Insight

Security Insight uses late accounting for historical reporting. When you view the reports in the dashboard, you might observe the following behavior for the selected duration options:

[1] 1 hour: Data for security violations triggered in last 1 minute might not be included.

[2] 1 day: Data for security violations triggered in last 1 hour might not be included.

[3] 1 week: Data for security violations triggered in last 1 day might not be included.

[4] 1 month: Data for security violations triggered in last 1 day might not be included.

[# 619713]

System

The updated host name for a NetScaler appliance does not appear on the LCD panel until after the appliance is restarted.

[# 560854]

In a high availability environment, if you add Network Time Protocol (NTP) to a primary node by specifying the NTP server's DNS name, the command is not propagated to the secondary node.

Workaround: Specify the NTP server's IP address.

[# 639529]

A NetScaler appliance might not initiate a rewrite action correctly if data is modified in adjacent fields in the message.

[# 657565, 686496]

When you run the set command on a NetScaler appliance, the ns.log file stores the command with all parameter values, including customer provided values.

[# 674165]

Random packets on loopback interface are found missing if you capture nstrace on a NetScaler appliance.

[# 689837]

A TCP transaction delay is observed if a NetScaler appliance is unable to use the TCP connection to connect to the back-end server. In this case, the appliance opens a new connection to forward the client requests to the back-end server after some waiting period. The waiting period ranges from 400 ms to 600 ms.

[# 690965]

A NetScaler appliance silently truncates and drops HTTP request body packets greater than the maximum HTTP header size configured in the HTTP profile. The request body is truncated only if the appliance receives an HTTP request after an incomplete header assembly (request header spanning more than one packet) and the request body is received when the appliance awaits a TCP acknowledgment for the request header sent to the server. The truncation results in TCP retransmission and latency issues.

[# 695668]

In a cluster deployment, the RESPONDER log messages do not appear when you run the following commands:

- The "show audit messages" command from command line interface.

- The "recent audit messages" command from NetScaler GUI.

Workaround:

You can locate the RESPONDER logs in /var/log/ns.log.

[# 703928]

Telco

In a Large Scale NAT deployment, the NetScaler appliance does not generate and send an ICMP error message to the subscriber in the event of a port allocation failure.

[# 540162]

In the output of the "show lsn sipalgcall -callid" command, the port value of the SIP control channel is incorrect.

[# 574257]

If the provisional response to a SIP REGISTER message does not contain an expiry value, the NetScaler appliance drops the message.

[# 574725]

Two different Syslog servers might log the same RTSP request.

[# 581086]

Web Interface on NetScaler (WIonNS)

Because the install WI package command takes more than the usual time to complete, it is not possible to return the status from other nodes. Therefore all the WI related packages, for example, JRE+WI, must be present on system, on the same path, for all the nodes.

[# 507753]

If the NetScaler appliance is upgraded from version 10.1 to 10.5 and the maxSite setting of Web Interface on NetScaler is 3, the system does not have sufficient memory to handle 5000 users accessing Web Interface on NetScaler.

[# 601304]

What's New in Previous NetScaler 11.0 Releases

The enhancements and changes that were available in NetScaler 11.0 releases prior to Build 72.16. The build number provided below the issue description indicates the build in which this enhancement or change was provided.

AAA-TM

Supporting Encrypted Assertions on SAML SP

When used as a SAML SP (service provider), the NetScaler appliance can now decrypt the encrypted tokens that it receives from the a SAML IdP. No configuration is required on the NetScaler.

[From Build 55.23]

[# 291693]

Including Additional Attributes in SAML IdP Assertion

When used as a SAML IdP (identity provider), the NetScaler appliance can now be configured to send 16 additional attributes in addition to the NameId attribute. These attributes must be extracted from the appropriate authentication server. For each of them, you can specify the name, the expression, the format, and a friendly name.

These attributes must be specified in the SAML IdP profile as follows:

Navigate to the screen where you configure the SAML IdP profile, and specify the additional attributes as required.

[From Build 55.23]

[# 460680, 504703]

The output of "show ns ip" now also includes the aaadnatIp address.

[From Build 55.23]

[# 472912]

Using the SHA256 Algorithm to Sign SAML IdP Assertions

When used as a SAML IdP (identity provider), the NetScaler appliance can now be configured to digitally sign assertions by using the SHA256 algorithm. Additionally, you can configure the appliance to accept only digitally signed requests from the SAML SP (service provider).

These configurations must be specified in the SAML IdP profile as follows:

Navigate to the screen where you configure the SAML IdP profile and specify the corresponding parameters.

[From Build 55.23]

[# 482185]

Logging Errors in NetScaler Log Files

The NetScaler appliance now stores AAA authentication logs.

- Errors and warnings are logged in the /var/nslog/ns.log file

- Information and debug level logs are logged in the /var/log/nsvpn.log file.

[From Build 55.23]

[# 482228, 479557]

Multi-Factor (nFactor) Authentication

The NetScaler appliance now supports a new approach to configuring multi-factor authentication. With this approach, you can configure any number of authentication factors. You can also customize the login form as required.

In NetScaler terminology, this feature is called "nFactor Authentication." For more information, see http://docs.citrix.com/en-us/netscaler-gateway/11/authentication-authorization/nfactor-for-gateway-authentication.html

[From Build 62.10]

[# 482250, 451913, 549966]

The NetScaler appliance now supports the SiteMinder SAML SP.

[From Build 55.23]

[# 488077]

OAuth/OpenID-Connect Mechanisms for AAA-TM

The NetScaler AAA-TM feature now supports OAuth and OpenID-Connect mechanisms for authenticating and authorizing users to applications that are hosted on applications such as Google, Facebook, and Twitter.

Note: OAuth on NetScaler is currently qualified only for Google applications.

A major advantage is that user's information is not sent to the hosted applications and therefore the risk of identity theft is considerably reduced.

In the NetScaler implementation, the application to be accessed is represented by the AAA-TM virtual server. So, to configure OAuth, an action must be configured and associated with a AAA-TM policy which is then associated with a AAA-TM virtual server. The configuration to define a OAuth action is as follows:

- Attributes (1 to 16) are attributes that can be extracted in OAuth response. Currently, these are not evaluated. They are added for future reference.

[From Build 55.23]

[# 491920]

Support for Redirect Binding for SAML SP

When used as a SAML SP (service provider), in addition to POST bindings, the NetScaler appliance now supports redirect bindings. In redirect bindings, SAML assertions are in the URL, as against POST bindings where the assertions are in the POST body.

When used as a SAML IdP (identity provider), the NetScaler appliance now allows logon using the following 401-based authentication mechanisms: Negotiate, NTLM, and Certificate.

[From Build 55.23]

[# 496725, 508689]

Using Cookies to Track SAML Sessions

In a deployment where a NetScaler appliance is configured as a SAML IdP (identity provider) for multiple SAML SPs (service provider), the appliance allows a user to access multiple SPs without explicitly authenticating every time.The appliance creates a session cookie for the first authentication and every subsequent request uses this cookie for authentication.

[From Build 55.23]

[# 503882]

Fallback to NTLM Authentication

When the NetScaler appliance is configured for Negotiate authentication and sends a 401 Negotiate response to client, if client is not able to reach domain controller or is not domain joined, then it automatically falls back to NTLM authentication and the client starts NTLM handshake. The NetScaler appliance is able to verify the credentials presented as part of NTLM authentication.

This feature allows user logins locally or remotely.

[From Build 55.23]

[# 509829]

Using Certificates to Log on to a SAML IdP

When used as a SAML IdP (identity provider), the NetScaler appliance now allows logon using certificates.

[From Build 55.23]

[# 512125]

The configuration of a AAA-TM virtual server in the NetScaler GUI is simplified for ease of configuring the required authentication mechanism.

[From Build 55.23]

[# 524386]

Fallback from Certificate to Other Authentication Mechanisms

When authentication is configured to be done by using certificates and then followed by LDAP or other authentication mechanisms, the following behavior holds true:

- In previous releases: If certificate authentication fails (or was skipped), the other authentication mechanism is not processed.

- From this release onwards: Even if certificate authentication is not done, the other authentication mechanism is processed.

[From Build 55.23]

[# 550946]

AAA-TM/NetScaler Gateway

When used as a SAML SP, the NetScaler appliance can now extract multi-valued attributes from a SAML assertion. These attributes are sent is nested XML tags such as:

In the SAML Service Provider (SP) module, names of the attributes that can be extracted from an incoming SAML assertion can be up to 127 bytes long. The previous limit was 63 bytes.

[From Build 64.34]

[# 581644]

Configuring Validity for SAML Assertions

A NetScaler appliance can be configured to provide SAML authentication to an application by playing the role of the SAML Identity Provider (IdP) and/or the SAML Service Provider (SP). If the system time on NetScaler SAML IdP and the peer SAML SP is not in sync, the messages might get invalidated by either party.

To avoid such cases, you can now configure the time duration for which the assertions will be valid. This duration, called the "skew time," specifies the number of minutes for which the message should be accepted. The skew time can be configured on the SAML SP and the SAML IdP.

- When the NetScaler is used as a SAML IdP, configure the skew time on the SAML IdP profile, to accept incoming requests from SP and to send assertions.

When used as a SAML IdP, the NetScaler appliance can now send multi-valued attributes in a SAML assertion.

[From Build 64.34]

[# 588125]

Admin Partitions

GSLB Support in Admin Partitions

The NetScaler appliance now supports the GSLB feature in admin partitions. You can now deploy, with an admin partition, applications that need the GSLB feature to distribute traffic across globally located datacenters.

[From Build 65.35]

[# 436582, 405290, 504574, 506221]

AAA-TM Support in Admin Partitions

The NetScaler appliance now supports the AAA-TM feature in admin partitions. You can now deploy, with an admin partition, enterprise applications that require authenticated access.

[From Build 65.35]

[# 481384]

Configuring Integrated Caching on a Partitioned NetScaler

Integrated caching (IC) can now be configured for admin partitions. After defining the IC memory on the default partition, the superuser can configure the IC memory on each admin partition such that the total IC memory allocated to all admin partitions does not exceed the IC memory defined on the default partition. The memory that is not configured for the admin partitions remains available for the default partition.

For example, if a NetScaler appliance with two admin partitions has 10 GB of IC memory allocated to the default partition, and IC memory allocation for the two admin partitions is as follows:

Note: If all IC memory is used by the admin partitions, no IC memory is available for the default partition.

[From Build 55.23]

[# 481444, 484618]

Getting NetScaler Trace for Specific Partitions

You can now generate the NetScaler trace for a specific admin partition. To do so, you must access that admin partition and run the "nstrace" operation. The trace files for the admin partition will be stored in the /var/partitions/<partitionName>/nstrace/ directory.

[From Build 55.23]

[# 496937, 515294]

Setting L2 and L3 parameters in Admin Partitions

On a partitioned NetScaler appliance, the scope of updating the L2 and L3 parameters is as follows:

- For L2 parameters that are set by using the "set L2Param" command, the following parameters can be updated only from the default partition, and their values are applicable to all the admin partitions: maxBridgeCollision, bdgSetting, garpOnVridIntf, garpReply, proxyArp, resetInterfaceOnHAfailover, and skip_proxying_bsd_traffic. The other L2 parameters can be updated in specific admin partitions, and their values are local to those partitions.

- For L3 parameters that are set by using the "set L3Param" command, all parameters can be updated in specific admin partitions, and their values are local to those partitions. Similarly, the values that are updated in the default partition are applicable only to the default partition.

[From Build 55.23]

[# 513564]

Supporting Dynamic Routing in Admin Partitions

While dynamic routing (OSPF, RIP, BGP, ISIS, BGP+) is by default enabled on the default partition, in an admin partition, it must be enabled by using the following command:

Using the NetScaler Web Logging (NSWL) client, the NetScaler can now retrieve the web logs for all the partitions with which the logged in user is associated. To view the partition for each log entry, customize the log format to include the %P option. You can then filter the logs to view the logs for a specific partition.

[From Build 55.23]

[# 534986]

Scriptable monitors can now be configured on the admin partitions that are available on a NetScaler appliance.

[From Build 55.23]

[# 535494]

Partition Specific Load Balancing Parameters

When you update load balancing parameters in an admin partition, the updates now apply to that partition only. You can have different load balancing parameter settings in different partitions.

Note:

- In previous releases, any updates to these parameters were applied across all partitions, regardless of the partition in which the changes were made.

- These parameters are set in the CLI by using the "set lb parameter" command or in the GUI by navigating to Traffic Management > Load Balancing.

The following load balancing features can now be configured in admin partitions:

- DBS autoscale

- Stateless connection mirroring

- RDP

- Radius

- Graceful shutdown

For the detailed list of NetScaler feature support on admin partitions, see http://docs.citrix.com/en-us/netscaler/11/system/admin-partition/admin-partition-config-types.html.

[From Build 64.34]

[# 588406]

Stateful Connection Failover/Mirroring Support in Admin Partitions

The NetScaler appliance now supports stateful connection mirroring in admin partitions. You can now deploy TCP-based applications in an admin partition, so that failure of one NetScaler appliance does not make the application unavailable.

Note: The application must be deployed in a NetScaler high availability (HA) setup, and connection mirroring must be configured for the application.

[From Build 65.35]

[# 599629]

Application Firewall

The NetScaler application firewall module offers data leak prevention and supports credit card protection. It can examines the credit card numbers in the response and takes the specified action if a match is found. In some scenarios, it might be desirable to exclude a specific set of numbers from the credit card security check inspection. For example, server responses for some internet applications might include a string of digits that is not a credit card number but matches the pattern of a credit card number. These responses can trigger false positives and therefore get blocked by the application firewall's Credit Card security check. The application firewall now offers the ability to learn and deploy relaxations for the credit card numbers. The credit card relaxation rule provides the flexibility to exclude a specific string of numbers from the safe commerce check without compromising credit card security. These numbers are not examined in the responses even if the credit card check is ON.

The application firewall is fully supported in striped, partially striped, or spotted configurations. The two main advantages of striped and partially striped virtual server support in cluster configurations are the following:

- Session failover support: Striped and partially striped virtual server configurations support session failover. The advanced application firewall security features, such as Start URL Closure and the Form Field Consistency check, maintain and use sessions during transaction processing. In ordinary high availability configurations, or in spotted cluster configurations, when the node that is processing the application firewall traffic fails, all the session information is lost and the user has to reestablish the session. In striped virtual server configurations, user sessions are replicated across multiple nodes. If a node goes down, a node running the replica becomes the owner. Session information is maintained without any visible impact to the user.

- Scalability: Any node in the cluster can process the traffic. Multiple nodes of the cluster can process the incoming requests served by the striped virtual server. This improves the application firewall's ability to handle multiple simultaneous requests, thereby improving the overall performance.

Security checks and signature protections can be deployed without the need for any additional cluster-specific application firewall configuration. You just do the usual application firewall configuration on the configuration coordinator (CCO) node for propagation to all the nodes.

Cluster details are available at http://docs.citrix.com/en-us/netscaler/11/system/clustering.html.

[From Build 55.23]

[# 408831, 403780]

The NetScaler application firewall offers SQL/XSS security check protections to detect and block possible attacks against the applications. You now have much tighter security control when configuring SQL/XSS protections. Instead of deploying relaxation rules that completely bypass the security check inspection for a field, you now have an option to relax a specific subset of violation patterns. You can continue to inspect the relaxed field in the incoming requests to detect and block the rest of the SQL/XSS violation patterns. The commands used in relaxations and learning now have optional parameters for value type and value expression. You can specify whether the value expression is a regular expression or a literal string.

The field format rules specify the inputs that are allowed in the target form fields. You can also limit the minimum and the maximum allowed length for the inputs. The application firewall learning engine monitors the traffic and provides field format recommendations based on the observed values. If the initial field format learned rules are based on a small sample of data, a few non typical values might possibly result in a recommendation that is too lenient for the target field. Updates to the application firewall have now decoupled violations and learning for the field formats. The firewall learns the field formats regardless of the violations. The learning engine monitors and evaluates all the incoming new data points to recommend new rules. This allows fine tuning the configuration to specify optimal input formats with adequate min/max range values. If a rule has already been deployed for a field/URL combination, the GUI allows the user to update the field format. A dialog box asks for confirmation to replace the existing rule. If you are using the command line interface, you have to explicitly unbind the previous binding and then bind the new rule.

[From Build 55.23]

[# 450326, 483677, 513927]

Geolocation, which identifies the geographic location from which requests originate, can help you configure the application firewall for the optimal level of security. For example, if an excessively large number of requests are received from a specific area, it is easy to determine whether they are being sent by users or a rogue machine. The application firewall offers you the convenience of using the built-in NetScaler database or any other geolocation based database to identify the source of origin of coordinated attacks launched from a country. This information can be quite useful for enforcing the optimal level of security for your application to block malicious requests originating from a specific geographical region. Geolocation logging uses the Common Event Format (CEF).

All application firewall graphical user interface (GUI) dialog boxes, including the ones for signatures, visualizer, and syslog viewer, are now completely free from any java dependencies and show a significant improvement in the overall performance. The HTML based GUI dialogues have been re-organized for enhanced user experience and intuitive workflow of information. Instead appearing in of pop-up dialog boxes with tabs, the information is now displayed as an in-line expansion. You can expand all the configuration sections and scroll up and down for a comprehensive view.

[From Build 55.23]

[# 506157]

All application firewall graphical user interface (GUI) dialog boxes, including the ones for signatures, visualizer, and syslog viewer, are now completely free from any java dependencies and show a significant improvement in the overall performance. The HTML based GUI dialogues have been re-organized for enhanced user experience and intuitive workflow of information. Instead appearing in of pop-up dialog boxes with tabs, the information is now displayed as an in-line expansion. You can expand all the configuration sections and scroll up and down for a comprehensive view.

[From Build 55.23]

[# 520048]

NetScaler now supports the IP Reputation feature, which is useful in identifying an IP address that is sending unwanted requests. You can use the IP reputation list to preemptively reject requests that are coming from an IP with a bad reputation. NetScaler uses WebRoot as the service provider for the dynamically generated malicious IP database and the metadata for those IPs. The IP Reputation feature can be configured by using PI Expressions in a policy. For example, you can configure an application firewall policy using expressions such as: CLIENT.IP.SRC.IPREP_IS_MALICIOUS.

[From Build 65.35]

[# 580866]

Cache Redirection

Support for default syntax expressions

You can now use default syntax expressions in cache redirection policies. The NetScaler appliance provides built-in cache redirection policies based on default syntax expressions, or you can create custom cache redirection policies to handle typical cache requests. In addition to the same types of evaluations done by classic cache redirection policies, the default syntax policies enable you to analyze more data (for example, the body of an HTTP request) and to configure more operations in the policy rule (for example, directing requests to either cache or origin server).

[From Build 55.23]

[# 490297, 495915, 536986, 536992, 537010, 537014, 538269]

CallHome

You can now configure the time interval for "Hard Disk Drive error" and "Compact Flash error" SNMP traps in a NetScaler appliance.

[From Build 65.35]

[# 568435]

CloudBridge Connector

Support for IPv6 Traffic through IPV4 Tunnels

The NetScaler appliance now supports transferring IPv6 traffic through a IPV4 GRE tunnel. This feature can be used for enabling communication between Isolated IPv6 networks without upgrading the IPv4 infrastructure between them.

For configuring this feature, you associate an PBR6 rule with the configured IPv4 GRE tunnel through which you want the NetScaler to send and receive IPv6 traffic. The source IPv6 address and destination IPv6 address parameters of the PBR6 rule specify the IPv6 networks whose traffic is to traverse the IPv4 GRE tunnel.

[From Build 55.23]

[# 497414]

Cluster

Reduce Backplane Steering for Spotted and Partially-striped Virtual Serves when Using ECMP

With the Equal Cost Multiple Path (ECMP) mechanism, virtual server IP addresses are advertised by all active cluster nodes. This means that traffic can be received by any cluster node, which then steers the traffic to the node that must process the traffic. While there are no hassles in this approach, there can be a lot of redundant steering in case of spotted and partially striped virtual servers. Therefore, from NetScaler 11 onwards, spotted and partially striped virtual server IP addresses are advertised only by the owner nodes. This reduces the redundant steering.

You can override this default behavior, by entering the following command in the VTYSH shell:

ns(config)# ns spotted-vip-adv all-nodes

[From Build 55.23]

[# 317706]

Routing on Striped SNIP addresses

You can now run dynamic routing on a striped SNIP address in a NetScaler cluster. The routes advertised by the cluster have the striped SNIP as the next hop. There is just one adjacency with the cluster. Internally, the cluster picks one of the active nodes as the routing leader. When the current routing leader goes down, the routing ownership moves to an active node.

Note:

- Striped SNIP addresses are useful mainly for cluster LA (link aggregation) deployments. They can also be used for ECMP, but the multipath routing functionality is unavailable.

- Striped SNIP addresses can also be used in asymmetrical topologies.

- Routing on striped SNIPs and routing on spotted SNIPs can coexist in a cluster.

To specify leader node configurations, in the VTYSH shell, use the "owner-node leader" command.

[From Build 55.23]

[# 329439]

Cluster to Include Nodes from Different Networks (L3 Cluster)

You can now create a cluster that includes nodes from different networks. To configure a cluster over L3, you must add the nodes of different networks to different nodegroups. For more information, see http://docs.citrix.com/en-us/netscaler/11/system/clustering/cluster-setup.html.

You can transition an existing L2 cluster to an L3 cluster. For instructions, see http://docs.citrix.com/en-us/netscaler/11/system/clustering/cluster-usage-scenarios/cluster-migrate-between-l2-l3.html.

[From Build 55.23]

[# 374289, 317257]

BridgeGroups are now supported in a NetScaler cluster deployment.

[From Build 55.23]

[# 494991]

Nodegroup for Datacenter Redundancy

A cluster nodegroup can now be configured to provide datacenter redundancy. In this use case, nodegroups are created by logically grouping the cluster nodes. You must create active and spare nodegroups. When the active nodegroup goes down, the spare nodegroup which has the highest priority (the lower priority number) is made active and it starts serving traffic.

For more information, see http://docs.citrix.com/en-us/netscaler/11/system/clustering/cluster-managing/cluster-nodegroups-datacenter-redundancy.html.

[From Build 55.23]

[# 495019]

Web Interface on NetScaler (WIonNS) Support on a Cluster

WIonNS can now be configured on a NetScaler cluster deployment. To use WIonNS on a cluster, you must do the following:

1. Make sure that the Java package and the WI package are installed in the same directory on all the cluster nodes.

3. Create services with IP addresses as the NSIP address of each of the cluster nodes that you want to serve WI traffic.

4. Bind the services to the load balancing virtual server.

Note: If you are using WIonNS over a VPN connection, make sure that the load balancing virtual server is set as WIHOME.

[From Build 62.10]

[# 498295, 489463]

Link Redundancy based on Minimum Throughput

In a dynamic cluster link aggregation (LA) deployment that has link redundancy enabled, you can configure the cluster to select the partner channel or interface on the basis of its throughput. To do this, configure a threshold throughput on the channel or interface as follows:

The throughput of the partner channels is checked against the configured threshold throughput. The partner channel that satisfies the threshold throughput is selected in FIFO manner. If none of the partner channel meets the threshold, or if threshold throughput is not configured, the partner channel with the maximum number of links is selected.

[From Build 55.23]

[# 508993]

FTP Load Balancing Support on a Cluster

FTP load balancing is now supported in a NetScaler cluster deployment.

[From Build 62.10]

[# 513612]

Routing in a L3 Cluster

In a L3 cluster, different nodegroups can have different VLANs and subnets associated with them. This can result in a VLAN getting exposed only in some nodes. Therefore, you can now configure dynamic routing on a VLAN to expose the VLAN to ZebOS even when there are no IP addresses with dynamic routing that are bound to it. The command to configure this is:

> add/set vlan <id> -dynamicRouting (ENABLED | DISABLED)

Note:

- This option is also available for VXLAN and BridgeGroups.

- This configuration can also be used for L2 clusters.

[From Build 55.23]

[# 531868]

Disabling Steering on the Cluster Backplane

By default, a NetScaler cluster steers traffic over the cluster backplane, from the flow receiver node to the flow processor node. You can disable steering so that the process becomes local to the flow receiver and thereby ensure that the flow receiver also becomes the flow processor. Such a configuration can come in handy when you have a high latency link.

Note: This configuration is applicable only for striped virtual servers.

Steering can be disabled at the global NetScaler level or at the individual virtual server level. The global configuration takes precedence over the virtual server setting.

- At the global level, steering can be disabled for all striped virtual servers. It is configured at cluster instance level. Traffic meant for any striped virtual server will not be steered on cluster backplane. The command is:

> add cluster instance <clId> -processLocal ENABLED

- At a virtual server level, you can disable steering for a specific striped virtual server. It is configured on a striped virtual server. Traffic meant for that virtual server will not be steered on cluster backplane. The command is:

> add lb vserver <name> <serviceType> -processLocal ENABLED

For more information, see http://docs.citrix.com/en-us/netscaler/11/system/clustering/cluster-managing/cluster-steering-disable.html.

[From Build 55.23]

[# 539136]

Reducing the Minimum Value for the Dead Interval

You can now set the dead interval for a cluster instance to a minimum value of 1 second.

Note: If the dead interval value is less than 3 seconds, set the hello interval parameter to 200 ms.

[From Build 64.34]

[# 573218]

Cluster versioning

When you are upgrading a cluster to NetScaler 11.0 build 64.x from an earlier NetScaler 11.0 build, cluster configuration propagation is disabled.

Traditionally, this issue occurred only during an upgrade of a cluster to a different NetScaler version (for example, from 10.5 to 11.0). This exception arises because the cluster version in build 64.x is different from the one in previous NetScaler 11.0 builds.

Note: Normally, the cluster version matches the NetScaler version.

Configuration propagation remains disabled until all the cluster nodes are upgraded to Build 64.x.

[From Build 64.34]

[# 591877]

Command Line Interface

The NetScaler administrator can now specify the maximum number of concurrent sessions a user can log on to the CLI. Although logons to the configuration utility do not count against the limit, all logon attempts are denied after the limit is reached. For example, if the maximum number of concurrent sessions is set to 20, a user can log on to the CLI 19 times and can log on to the configuration utility any number of times. Once the user logs on to the CLI for the 20th time, he or she can no longer log on to the CLI or the configuration utility. Any logon attempt then results in a system error message.

[From Build 64.34]

[# 491778]

DNS

Enable or disable negative caching of DNS records

The NetScaler appliance supports caching of negative responses for a domain. You can enable or disable negative caching from the command line, by setting cacheNegativeResponses with the set dns parameter command, or in the configuration utility, in the Configure DNS Parameters dialog box.

Note: You can enable or disable negative caching independent of global caching. By default, negative caching is enabled.

[From Build 55.23]

[# 391254]

Rewrite and responder support for DNS

The rewrite and responder features now support DNS. You can now configure rewrite and responder functionalities to modify DNS requests and responses as you would for HTTP or TCP requests and responses.

[From Build 55.23]

[# 405769]

Support for DNS Logging

You can now configure a NetScaler appliance to log DNS requests and responses. The logs are in SYSLOG format. You can use these logs to:

- Audit the DNS responses to the client

- Audit DNS clients

- Detect and prevent DNS attacks

- Troubleshoot

[From Build 55.23]

[# 419632, 561291]

GSLB

Support for binding a single Virtual Server as a backup for multiple GSLB Virtual servers

In a GSLB site deployment, you can now bind a single virtual server as a backup virtual server for multiple GSLB virtual servers in the deployment.

[From Build 55.23]

[# 373061]

NetScaler GSLB deployments support NAPTR records

In GSLB deployments, the NetScaler appliance now supports DNS queries with NAPTR records. You can now configure a NetScaler appliance to receive DNS queries with NAPTR records from clients (for example, Mobile Management Entity (MME))and respond with the list of services configured for a domain. Also, the NetScaler appliance monitors the health of the services and in the response it provides only the list of services that are up.

[From Build 64.34]

[# 468647]

GSLB Service Selection using Content Switching

Description: You can now configure a content switching (CS) policy to customize a GSLB deployment so that you can:

* Restrict the selection of a GSLB service to a subset of GSLB services bound to a GSLB virtual server for the given domain.

* Apply different Load Balancing methods on the different subsets of GSLB services in the deployment.

* Apply spillover policies on a subset of GSLB services, and you can have a backup for a subset of GSLB services.

* Configure a subset of GSLB services to serve a specific type of content.

* Define a subset GSLB services with different priorities, and define the order in which the services in the subset are applied to a request.

For more information, see Configuring GSLB Service Selection Using Content Switching.

[From Build 63.16]

[# 503588]

Ability to specify GSLB Site IP address as source IP address for an RPC node

You can now configure the NetScaler appliance to use GSLB Site IP address as the source IP address for an RPC node.

In earlier releases, if the internal dispatcher failed, the services that used scriptable monitors also went down and the appliance had to be restarted. From release 11, if the internal dispatcher fails, the pitboss process restarts it. As a result, you no longer have to restart the appliance. For information about user monitors, see http://docs.citrix.com/en-us/netscaler/11/traffic-management/load-balancing/load-balancing-custom-monitors/understand-user-monitors.html.

[From Build 55.23]

[# 368128]

Setting the Maintenance State for your Server with Minimal Interruption

You can now set the maintenance state for your server with minimal interruption and without changing any configuration on the NetScaler appliance. In the maintenance state, the server continues to accept persistent client connections while new connections are load balanced among the active servers. On the NetScaler appliance, configure a transition out of service (TROFS)-enabled monitor and bind it to a service representing the server. Specify a trofsCode or trofsString in the monitor. Upon receipt of a matching code or string from the server in response to a monitor probe, the appliance places the service in the TROFS state. During this time, it continues to honor persistent client connections.

To avoid disrupting established sessions, you can place a service in the TROFS state by doing one of the following:

- Adding a TROFS code or string to the monitor: Configure the server to send a specific code or string in response to a monitor probe.

- Explicitly disable the service and:

- Set a delay (in seconds).

- Enable graceful shut down.

Adding a TROFS Code or String

Note: This enhancement is not applicable to GSLB services.

From release 11, if you bind only one monitor to a service, and the monitor is a TROFS-enabled monitor, it can place the service in the TROFS state on the basis of the server's response to a monitor probe. This response is compared with the value in the trofsCode parameter for an HTTP monitor or the trofsString parameter for an HTTP-ECV or TCP-ECV monitor. If the code matches, the service is placed in the TROFS state. In this state, it continues to honor the persistent connections.

If multiple monitors are bound to a service, the effective state of the service is calculated on the basis of the state of all the monitors that are bound to the service. Upon receiving a TROFS response, the state of the TROFS-enabled monitor is considered as UP for the purpose of this calculation. For more information about how a NetScaler appliance designates a service as UP, see http://docs.citrix.com/en-us/netscaler/10-5/ns-tmg-wrapper-10-con/ns-lb-wrapper-con-10/ns-lb-clienttraffic-con/ns-lb-clienttraffic-gracefulshutdown-tsk.html.

Important!

- You can bind multiple monitors to a service, but only one monitor must be TROFS-enabled.

- You can convert a TROFS-enabled monitor to a monitor that is not TROFS-enabled, but not vice versa.

[From Build 55.23]

[# 408103]

Support for Secure LDAP Monitor

You can now monitor LDAP services over SSL. To monitor the LDAP services over SSL, use the built-in LDAP monitor or create a user monitor and enable the "secure" option.

[From Build 55.23]

[# 418061, 556530]

New Trap for Spillover

If you have configured spillover on a virtual server and also configured a trap listener on the appliance, an SNMP trap is now sent to the trap listener when the virtual server experiences spillover. The trap message displays the name of the virtual server that experienced the spillover, the spillover method, the spillover threshold, and the current spillover value. If the spillover is policy based, the rule causing it appears in the Spillover Threshold field. If the virtual server is DOWN or disabled, the status message "vserver not up" appears in the trap message.

[From Build 55.23]

[# 486268, 475400]

Retaining the Original State of a Service Group Member after Disabling and Enabling a Virtual Server

A new global option, -retainDisableServer, enables you to retain a service-group member's state when a server is disabled and reenabled.

Previously, a member's state would change from DISABLED to ENABLED under the following set of conditions:

- Two applications are deployed on the same port on a virtual server.

- Two service groups with a common member are bound to this virtual server, and the common member is enabled in one group and disabled in the other.

- The server is disabled and then reenabled.

Under these conditions, disabling the server disables all the service group members, and reenabling the server enables all the members, by default, regardless of their earlier states. To bring the members back to the original states, you must manually disable those member(s) in the service group. This is a cumbersome task and prone to errors.

[From Build 64.34]

[# 493692]

The following global timeouts has been introduced for TCP sessions on a NetScaler appliance related to RNAT rules, forwarding sessions, or load balancing configuration of type ANY:

These timeout can be set either from the NetScaler command line (set ns timeout command) or from the configuration utility (System > Settings > Change Timeout Values page).

Note: For applying these timeouts to a virtual server or service of type ANY, set these timeouts before adding the virtual server or the service.

[From Build 55.23]

[# 507701]

IPv6 Support for HTTP based User Monitors

You can now use IPv6 addresses in the following monitors:

- USER

- SMTP

- NNTP

- LDAP

- SNMP

- POP3

- FTP_EXTENDED

- STOREFRONT

- APPC

- CITRIX_WI_EXTENDED

Note: The monitor for MySQL does not support IPv6 addresses.

[From Build 55.23]

[# 510111]

If you configure cookie persistence and custom cookie on a virtual server, and later change the name or IP address of the virtual server, persistence is not honored.

[From Build 55.23]

[# 524079, 559022]

With the following new OID, you can use SNMP to learn the effective state of a virtual server.

vsvrCurEffState, 1.3.6.1.4.1.5951.4.1.3.1.1.75

[From Build 64.34]

[# 538499]

With the following new OID, you can use SNMP to learn the current number of server connections per service.

svcCurSrvrConnections, 1.3.6.1.4.1.5951.4.1.2.1.1.59

[From Build 64.34]

[# 548470]

GSLB Powered Zone Preference

In a distributed XenApp/XenDesktop deployment, StoreFront might not select an optimal datacenter when multiple equivalent resources are available from multiple datacenters. In such cases, StoreFront randomly selects a datacenter. It can send the request to any of the XenApp/XenDesktop servers in any datacenter, regardless of proximity to the client making the request.

With this enhancement, the client IP address is examined when an HTTP request arrives at the NetScaler Gateway appliance, and the real client IP address is used to create the datacenter preference list that is forwarded to StoreFront. If the NetScaler appliance is configured to insert the zone preference header, StoreFront 3.5 or later can use the information provided by the appliance to reorder the list of delivery controllers and connect to an optimal delivery controller in the same zone as the client. StoreFront selects the optimal gateway VPN virtual server for the selected datacenter zone, adds this information to the ICA file with appropriate IP addresses, and sends it to the client. Storefront then tries to launch applications hosted on the preferred datacenter's delivery controllers before trying to contact equivalent controllers in other datacenters.

For more information about this enhancement, see http://docs.citrix.com/en-us/netscaler/downloads/global-server-load-balancing-powered-zone-preference.pdf.

[From Build 65.35]

[# 571032]

Support for Unauthenticated Stores

In earlier releases, the StoreFront monitor tried to authenticate anonymous stores. As a result, a service could be marked as DOWN and you could not launch XenApp or XenDesktop by using the URL of the load balancing virtual server.

The probe order has changed. The monitor now determines the state of the StoreFront store by successively probing the account service, the discovery document, and then the authentication service, and skips authentication for anonymous stores.

[From Build 64.34]

[# 575549]

NetScaler Gateway

This enhancement adds support to disable Autoupdate for NetScaler Gateway Endpoint Analysis and VPN plug-in.

[From Build 55.23]

[# 236620]

Automatic session timeout can be enabled for ICA connections as a VPN parameter. Enabling this parameter forces active ICA connections to time out when a VPN session closes.

[From Build 55.23]

[# 358672, 527884]

NetScaler now uses SPNEGO encapsulation on Kerberos tickets that are sent to backend web applications and servers.

[From Build 55.23]

[# 404899]

Plug-in Icon Decoupling from Citrix Receiver

The desktop client plug-ins icons can now be configured to operate independently from Native Citrix Receiver clients. Settings to manage Receiver integration with the NetScaler Gateway Plug-ins can be configured globally and within session policies.

[From Build 55.23]

[# 406312]

This enhancement adds support for cross-domain Kerberos constrained delegation when both the user and the service realm have a two-way shortcut trust. That is, if the user and service belong to different domains/realms, constrained delegation fails. However, if a user logs on with a user name and password, Kerberos Single Sign-On works for cross-domain access, because the NetScaler Gateway appliance does Kerberos impersonation with the user password. NetScaler Gateway currently does not otherwise support cross-domain constrained delegation.

[From Build 55.23]

[# 444387]

The Portal Customization options have been expanded to allow end-to-end customization of the VPN user portal. Administrators can apply themes to their VPN portal design or use them as a foundation for their own customization or branding. An option to present VPN users an End User License Agreement (EULA) has also been added to the portal design. Portal themes and EULAs can be bound to a VPN virtual server or specified as global VPN parameters.

[From Build 55.23]

[# 489467]

Striped Cluster for NetScaler Gateway in ICA Proxy Mode

This feature allows administrators to deploy NetScaler Gateway with XenApp and XenDesktop in a striped style cluster where all nodes in the cluster serve traffic. Administrators can use existing Gateway configurations and scale seamlessly in a cluster deployment without having to restrict the VPN configuration to a single node.

Note that this feature is limited to ICA Proxy basic mode virtual servers and does not support SmartAccess.

NetScaler Gateway now has a full Linux VPN client plug-in. The plug-in is supported on Ubuntu 12.04 and 14.04 distributions.

[From Build 55.23]

[# 495767]

WebFront is an alternative integration point for XenApp and XenDesktop deployments served by StoreFront. Resident on NetScaler, WebFront uses caching and packet flow optimization in the distribution of user stores. These techniques improve end user experience for Receiver for Web users and speeds up single sign-on for native Receiver users. In the NetScaler configuration utility, the WebFront feature is on the Configuration tab at System --> WebFront.

[From Build 55.23]

[# 497619]

The WebFront enhancement supports the transparent SSO feature when accessed from the Citrix Receiver. WebFront optimizes packet flow and improves performance for users accessing StoreFront through Gateway using Citrix Receivers. Data transferred over WAN is reduced by 41%.

[From Build 55.23]

[# 497625]

NetScaler with Unified Gateway

This feature extends NetScaler Gateway connectivity with access to any web application through a single URL, along with seamless single sign-on and sign-off. Single URL access can be configured for:

- Internal organizational web applications

- Software as a Service applications, including SAML based single sign-on when available

The feature can be configured and managed with the Unified Gateway wizard in the NetScaler configuration utility.

[From Build 55.23]

[# 519875]

Support for Common Gateway Protocol (CGP) over WebSockets

NetScaler Gateway virtual servers have improved intelligence for handling CGP traffic destined for the common CGP port, 2598, over WebSockets. This enhancement allows Receiver for HTML5 user sessions through NetScaler Gateway to support Session Reliability.

[From Build 55.23]

[# 519899]

NetScaler Gateway now has an Android client plug-in that supports full VPN capabilities. The plug-in supports Android versions 4.1 and later.

[From Build 55.23]

[# 520483]

The Dual-Hop enhancement enables next-hop requests to be distributed among several available NetScalers. The Dual-Hop feature expands the capability to load balance across any next-hop server, so that if one next-hop server is unavailable, connections can be re-established using another available server.

This enhancement supports the below configurations:

- Create a LB Vserver on DMZ NetScaler for the next-hop targets, and allow this LB to be added as a Next-Hop Server.

- Specify a next-hop server as an FQDN name so a GSLB solution could be used

[From Build 64.34]

[# 524991]

The SmartControl feature allows administrators to apply access policies for various XenApp and XenDesktop attributes through NetScaler Gateway without the need for identical policy duplication on the XenApp or XenDesktop servers.

[From Build 55.23]

[# 525947]

For Linux Clients, support for binding Intranet IPv6 to VPN Virtual Server is introduced.

IPv6 binding with VPN Global support is also introduced with the same.

[From Build 63.16]

[# 556101]

The default value for the VPN parameter "transparentInterception" is now set to OFF. You must set it to ON when full tunnel access is needed. For more information, see https://www.citrix.com/blogs/2015/12/11/new-vpn-default-in-netscaler-11-0.

[From Build 64.34]

[# 560267, 564572]

Support for Redirect Binding for SAML IdP

NetScaler appliances now support GET requests from SAML service providers.

When used as a SAML Identity Provider (IdP), the NetScaler appliance can be configured to serve assertions only to SAML Service Providers (SPs) that are preconfigured on or trusted by the IdP. For such a configuration, the SAML IdP must have the service provider ID (or issuer name) of the relevant SAML SPs. You can use either the CLI of the GUI to configure the appliance to serve assertions.

NetScaler Gateway now supports the new UDP-based Framehawk virtual channel.

[From Build 62.10]

[# 587560]

NetScaler Gateway now has a full iOS VPN client plug-in. The plug-in is supported on iOS 7 and later releases.

[From Build 55.23]

[# 587571]

The VPN plugin was enhanced to acknowledge the intranet application protocol flag. ICMP blocking can be achieved by configuring separate intranet applications for UDP and TCP.

[From Build 64.34]

[# 589202]

Support for EPA verbose logging was added.

[From Build 64.34]

[# 590932, 591183]

The NetScaler appliance was enhanced so the Portal Theme can be added using the NetScaler Gateway Wizard.

[From Build 63.16]

[# 591427]

Unified Gateway now supports the same cluster functionality as supported by the NetScaler Gateway. Earlier Unified Gateway did not support a cluster environment.

[From Build 64.34]

[# 593064]

DTLS-TURN support for Unified Gateway was added. For Unified Gateway, the CS virtual server is the end-point that users connect. The VPN virtual server has to be bound as the target virtual server. This functionality enables support for secure external access using Framehawk display channel with XenApp and XenDesktop.

[From Build 64.34]

[# 593568]

NetScaler has a new nFactor feature used for authentication. The nFactor feature enables a new set of authentication possibilities. Administrators using nFactor have AAA flexibility when configuring authentication factors for virtual servers. The number of policy banks can be extended to suit different needs. Based on previous factors, nFactor determines a method of authentication. Dynamic login forms and on-failure actions are possible by using nFactor.

[From Build 66.11]

[# 597011]

NetScaler Insight Center

Exporting Reports

You can now save the Web Insight reports or HDX Insight reports in PDF, JPEG, PNG , or CSV format on your local computer. You can also schedule the export of the reports to specified email addresses at various intervals.

For more information, see http://docs.citrix.com/en-us/netscaler-insight/11-0/viewing-reports/ni-export-report-con.html.

[From Build 55.23]

[# 320860]

Multi-Hop support for NetScaler Insight Center enables Insight Center to detect which Citrix appliances a connection passes through (CloudBridge, NetScaler, NetScaler Gateway), and in which order, for improved reporting.

[From Build 55.23]

[# 383172]

Insight Deployment Management

You can now improve the processing power of and increase storage space in your NetScaler Insight Center deployment by adding agents, connectors, and databases. An agent processes HTTP traffic and sends the data to the connectors that distribute this data across databases. You can add multiple agents, connectors, and databases to scale your deployment. In this deployment, you can also the decide the number of resources you have to allocate and determine the elements you need in the database architecture, on the basis of the number of HTTP requests per second, number of ICA sessions, and number of active WAN connections.

[From Build 55.23]

[# 404919]

You can now increase the storage space of NetScaler Insight Center to 512 GB.

[From Build 55.23]

[# 425761, 553254]

The WAN Insight feature of NetScaler Insight Center gives CloudBridge administrators an easy way to monitor the accelerated and unaccelarted WAN traffic that flows through CloudBridge datacenter and CloudBridge branch appliances, and it provides end-to-end visibility that includes client-specific data, application-specific data, and branch- specific data. With the ability to identify and monitor all the applications, clients, and branches on the network, you can effectively deal with the issues that degrade performance.

[From Build 55.23]

[# 430882]

Hop Diagram Support

The HDX Insight reports now support hop diagrams, which provide complete details about the client, NetScaler ADC, and server in an active session.

To display the hop diagram, on the dashboard tab, navigate to HDX Insight > Users >, click on a user name and, in the Current Application Sessions table, click on the session diagram icon.

[From Build 55.23]

[# 443824]

You can now identify the root cause of a terminated ICA session by viewing the session termination reason on the HDX Insight node. Along with the termination reason, it also displays the session TCP metrics such as ICA RTT and WAN Latency.

You can now configure NetScaler Insight Center to display the reports in your local time or GMT time.

[From Build 55.23]

[# 491073]

You can configure NetScaler Insight Center to display the geo maps for a particular geographical location or LAN by specifying the private IP range (start and end IP address) for the location.

[From Build 55.23]

[# 502478]

After an ICA connection is established between a client and a NetScaler Gateway appliance, errors or old receiver or server versions, can prevent the appliance from exporting the AppFlow records to NetScaler Insight Center.

In such cases, the NetScaler Insight Center dashboard now displays the reasons for which the NetScaler appliance does not export the AppFlow records.

[From Build 55.23]

[# 504954]

You can now configure a DNS server when you set up NetScaler Insight Center. Configuring a DNS server helps resolve the host name of a server into its IP address.

For example, while creating an email server, you now have an option to specify the server name of the server rather than the IP address.

[From Build 55.23]

[# 514612]

The NetScaler Insight Center configuration utility now displays the progress of the upgrade process.

[From Build 55.23]

[# 519788, 522021]

Gateway Insight

Gateway Insight provides visibility into the failures encountered by all users, regardless of the access mode, at the time of logging on to NetScaler Gateway. You can view a list of all available users, number of active users, number of active sessions, and bytes and licenses used by all users at any given time. You can view the end-point analysis (EPA), authentication, single sign-on (SSO), and application launch failures for a user. You can also view the details of active and terminated sessions for a user.

Gateway Insight also provides visibility into the reasons for application launch failure for virtual applications. This enhances your ability to troubleshoot any kind of logon or application launch failure issues. You can view the number of applications launched, number of total and active sessions, and the number of total bytes and bandwidth consumed by the applications. You can view details of users, sessions, bandwidth, and launch errors for an application.

You can view the number of gateways, number of active sessions, and the total bytes and bandwidth used by all gateways associated with a NetScaler Gateway appliance at any given time. You can view the EPA, authentication, SSO, and application-launch failures for a gateway. You can also view the details of all users associated with a gateway, and their logon activity.

To enable Gateway Insight for your NetScaler Gateway appliance, you must first add the NetScaler Gateway appliance to NetScaler Insight Center. You must then enable AppFlow for the virtual server representing the VPN application in NetScaler Insight Center.

Navigation: Dashboard > Gateway Insight

[From Build 65.35]

[# 547839, 519787]

Security Insight

Web and web service applications that are exposed to the Internet have become increasingly vulnerable to attacks. To protect applications from attack, you require visibility into the nature and extent of past, present, and impending threats, real-time actionable data on attacks, and recommendations on countermeasures. Security Insight provides a single-pane solution to help you assess your application security status and take corrective actions to secure your applications.

Security insight is included in NetScaler Insight Center, and it periodically generates reports based on your Application Firewall and NetScaler system security configurations. The reports include the following information for each application:

-Threat index. A single-digit rating system that indicates the criticality of attacks on the application, regardless of whether or not the application is protected by a NetScaler appliance. The more critical the attacks on an application, the higher the threat index for that application.

-Safety index. A single-digit rating system that indicates how securely you have configured the NetScaler devices to protect applications from external threats and vulnerabilities. The lower the security risks for an application, the higher the safety index.

-Actionable Information. Information that you need to lower the threat index and increase the safety index, which significantly improves application security. For example, you can review information about violations, existing and missing security configurations in Application Firewall and NetScaler security features, the rate at which the applications are being attacked, and so on.

[From Build 65.35]

[# 587137]

The following thin clients now support HDX Insight:

-WYSE Windows based thin clients

-WYSE Linux based thin clients

-WYSE ThinOS based thin clients

-10Zig Ubuntu based thin clients

[From Build 65.35]

[# 614892]

Viewing the GET or POST requests

The NetScaler Insight Center now displays the GET or POST requests that are sent by the client to a domain. To view the GET or POST requests, navigate to Domains > URLs > Clients > Http Request Method, or to Domains > URLs > Http Request Method > Clients.

[From Build 65.35]

[# 620323]

NetScaler Insight Center is now supported on KVM hypervisors.

[From Build 66.11]

[# 631295]

NetScaler SDX Appliance

Management service now provides support for SNMP v3 traps in addition to the already existing support for SNMP v2 traps. SNMP v3 provides better administration and security capabilities through better encryption, authentication and data integrity mechanisms.

[From Build 55.23]

[# 431687]

If you create channels on SDX and use these channels in VPXs and then take a backup of the appliance to restore either the complete appliance or selected instances, then channels are not restored and instances may fail.

[From Build 55.23]

[# 432899, 435206]

Default time zone

The default timezone when management service creates NetScaler instances is the NTP timezone. When this default timezone is modified using the management service, then the update is synchronized across the NetScaler instances

[From Build 55.23]

[# 451866, 492929]

Appliance Reboot Progress Status

NetScaler SDX Appliance now displays the reboot progress. This helps in keeping the user informed about the various stages of the appliance reboot.

[From Build 55.23]

[# 454093]

NetScaler SDX supports cluster with three tuple notation.

[From Build 55.23]

[# 470894]

Initiate Virtual-NMI

The Initiate Virtual-NMI generates a core dump of a VPX instance. Initiating a virtual NMI is useful when your NetScaler instance has stopped responding. To generate a virtual NMI, click on Configuration > Diagnostics. Click Initiate NMI under Non-Maskable Interrupt.

[From Build 55.23]

[# 475027]

When you use the NetScaler provisioning wizard, the option to upload the XVA file has been added to the wizard. To use the XVA file to create a NetScaler instance, you need to first upload the XVA file.

[From Build 55.23]

[# 476695]

Syslog Viewer

Syslog Viewer helps you in searching through the syslog messages based on various filters. You can narrow your search based on module like API, CLI, CONFIG, EVENT etc. You can further choose the type of message that you want to search through, like, ALERT, CRITICAL etc. Syslog Viewer also provides the option to search through regular expression or based on case sensitive text

[From Build 55.23]

[# 478512]

In the Management Service, the user interface for licensing the NetScaler SDX appliances is now identical to the user interface for licensing the NetScaler MPX and NetScaler VPX appliances.

[From Build 55.23]

[# 479628, 517234]

Retrieve LDAP Server Attributes

When you configure an LDAP server and provide the IP address of the LDAP server, the management service automatically fetches the attributes like Server Logon Name Attribute, Search Filter, Group Attribute, Sub Attribute Name. This helps in reducing the error during filling these details for LDAP configuration.

[From Build 55.23]

[# 491661]

Setup Wizard

You can use the Setup Wizard to complete all the first time configurations in a single flow. You can use the wizard to assign various management network IP addresses, configure system settings, change the default admin password, manage and update licenses.

You can also use this wizard to modify the network configuration details that you provided for the NetScaler SDX appliance during initial configuration.

You can now specify an IP address as a static route when provisioning a NetScaler instance. The instance then uses this address, instead of the default route, to connect to the Management Service.

[From Build 64.34]

[# 498445]

Partial Licensing

You can now partially allocate licenses as required for your deployment. For example, if your license file contains ten licenses, but your current requirement is for only six licenses, you can allocate six licenses now, and allocate additional licenses later. You cannot allocate more than the total number of licenses present in your license file.

[From Build 55.23]

[# 519771]

Clean Install

You can use the clean install feature to downgrade the software version of a NetScaler SDX appliance without losing the IP addresses or passwords. Clean install is different than factory reset in the manner that you can choose the SDX version to which you want to downgrade the appliance.

To perform a clean install, navigate to Configuration > System > System Administration. In the System Administration Group, click Appliance Reset and follow the prompts.

Ability to configure SSL Ciphers to Securely Access the Management Service

You can select SSL cipher suites from a list of SSL ciphers supported by SDX appliances, and bind any combination of the SSL ciphers to access the Management Service securely through HTTPS

[From Build 64.34]

[# 530232]

Management service now provides support for XenServer 6.5.

[From Build 55.23]

[# 538641]

Options to disable and enable TLSv1, TLSv1.1, and TLSv1.2 has been added in the Management Service. To enable or disable TLS, navigate to Configuration > System. In the System Settings group, click on Change SSL Settings link.

[From Build 55.23]

[# 540347]

Option to Disable nsrecover Login Account

Using the Management Service interface, you can now disable the nsrecover login account. To disable the nsrecover login account, navigate to "Configuration > System > Configure System Settings" and clear the "Enable nsrecover Login" check box.

[From Build 64.34]

[# 576375]

Support to Encrypt Backup Files

The Management Service now provides an option to encrypt the backup files.

NetScaler VPX Appliance

The following licenses are now available for NetScaler VPX appliance on ESX platform:

- 25M

- 5G

- 10G

- 15G

- 25G

- 40G

For more information about recommended interfaces and performance details, refer to the latest VPX datasheet.

[From Build 68.10]

[# 623179]

New license for NetScaler VPX on ESX Platform

The following licenses are now available for NetScaler VPX appliance on ESX platform:

- 25M

- 5G

- 10G

- 15G

- 25G

- 40G

For more information about recommended interfaces and performance details, refer to the latest VPX datasheet.

[From Build 68.11]

[# 623179]

Networking

Redundant Interface Sets

A redundant interface set is a set of interfaces in which one interface is active and the others are on standby. If the active interface fails, one of the standby interfaces takes over and becomes active.

Following are the main benefits of using redundant interface sets:

- The back-up links between the NetScaler appliance and a peer device ensure connection reliability.

- Unlike link redundancy using LACP, no configuration is required on the peer device for a redundant interface set. To the peer device, a redundant interface set appears as individual interfaces, not as a set or collection.

- In a high availability (HA) configuration, redundant interface sets can minimize the number the HA failovers.

A redundant interface set is specified in LR/X notation, where X can range from 1 to 4. For example, LR/1.

[From Build 55.23]

[# 355237, 186503, 249551]

MAC Address Wildcard Mask for Extended ACLs

A new wildcard mask parameter for extended ACLs and ACL6s can be used with the source MAC address parameter to define a range of MAC addresses to match against the source MAC address of incoming packets.

MAC Address Wildcard Mask for PBRs

A new wildcard mask parameter for PBRs and PBR6s can be used with the source MAC address parameter to define a range of MAC addresses to match against the source MAC address of outgoing packets.

[From Build 55.23]

[# 391630]

Client Source Port for Server Side Connections related to INAT and RNAT Rules

The NetScaler appliance, for INAT and RNAT rules, now supports using client port as the source port for server side connections. A parameter Use Proxy Port has been added to the INAT and RNAT command set. When Use Proxy Port is disabled for an INAT rule or an RNAT rule, the NetScaler appliance retains the source port of the client's request for the server side connection. When the option is enabled (default), the NetScaler appliance uses a random port as the source port for the server side connection. You must disable this parameter for proper functioning of certain protocols that require a specific source port in the request packet.

[From Build 55.23]

[# 399821]

Keeping a VIP address in the Backup State

By default, for configurations with USIP option disabled or with USIP and use proxy port options enabled, the NetScaler appliance communicates to the servers from a random source port (greater than 1024).

The NetScaler supports using a source port from a specified port range for communicating to the servers. One of the use case of this feature is for servers that are configured to identify received traffic belonging to a specific set on the basis of source port for logging and monitoring purposes. For example, identifying internal and external traffic for logging purpose.

For more information, see http://docs.citrix.com/en-us/netscaler/11/traffic-management/load-balancing/load-balancing-manage-clienttraffic/use-specified-sourceport.html.

[From Build 64.34]

[# 420067, 420039]

Stateful Connection Failover Support for RNAT

Connection failover helps prevent disruption of access to applications deployed in a distributed environment. The NetScaler appliance now supports stateful connection failover for connections related to RNAT rules in a NetScaler High Availability (HA) setup.

In an HA setup, connection failover (or connection mirroring) refers to the process of keeping an established TCP or UDP connection active when a failover occurs. The primary appliance sends messages to the secondary appliance to synchronize current information about the RNAT connections. The secondary appliance uses this connection information only in the event of a failover. When a failover occurs, the new primary NetScaler appliance has information about the connections established before the failover and hence continues to serve those connections even after the failover. From the client's perspective this failover is transparent. During the transition period, the client and server may experience a brief disruption and retransmissions.

Connection failover can be enabled per RNAT rule. For enabling connection failover on an RNAT rule, you enable the connFailover (Connection Failover) parameter of that specific RNAT rule by using either NetScaler command line or configuration utility. Also, you must disable the tcpproxy (TCP Proxy) parameter globally for all RNAT rules in order for connection failover to work properly for TCP connections.

[From Build 65.35]

[# 457167]

Jumbo Frames Support for NetScaler VPX Appliances

NetScaler VPX appliances now support receiving and transmitting jumbo frames containing up to 9216 bytes of IP data. Jumbo frames can transfer large files more efficiently than is possible with the standard IP MTU size of 1500 bytes.

A NetScaler appliance can use jumbo frames in the following deployment scenarios:

- Jumbo to Jumbo. The appliance receives data as jumbo frames and sends it as jumbo frames.

- Non-Jumbo to Jumbo. The appliance receives data as regular frames and sends it as jumbo frames.

- Jumbo to Non-Jumbo. The appliance receives data as jumbo frames and sends it as regular frames.

Jumbo Frames support is available on NetScaler VPX appliances running on the following virtualization platforms:

- Set the MTU of the interface or channel of the VPX appliance to a value in the range 1501-9216. Use the NetScaler command line interface or the configuration utility of the VPX appliance to set the MTU size.

- Set the same MTU size on the corresponding physical interfaces of the virtualization host by using its management applications.

[From Build 55.23]

[# 464830, 478103, 485905]

OSPFv3 Authentication

For ensuring the integrity, data origin authentication, and data confidentiality of OSPFv3 packets, OSPFv3 authentication must be configured on OSPFv3 peers.

The NetScaler appliance supports OSPFv3 authentication and is partially compliant with RFC 4552. OSPFv3 authentication is based on the two IPSec protocols: Authentication Header (AH) and Encapsulating Security Payload (ESP). The NetScaler supports only the AH protocol for OSPFv3 authentication.

OSPFv3 authentication use manually defined IPSec Security Associations (SAs) between the OSPFv3 peers and does not rely on IKE protocol for forming dynamic SAs. Manual SAs define the security parameter Index (SPI) values, algorithms, and keys to be used between the peers. Manual SAs require no negotiation between the peers; therefore, same SA must be defined on both the peers.

You can configure OSPFv3 authentication on a VLAN or for an OSPFv3 area. When you configure for a VLAN, the settings are applied to all the interfaces that are member of the VLAN. When you configure OSPFv3 authentication for an OSPF area, the settings are applied to all the VLANs in that area. The settings are in turn applied to all the interfaces that are members of these VLANs. These settings do not apply to member VLANs on which you have configured OSPFv3 authentication directly.

[From Build 55.23]

[# 471703]

Support of IPv6 Dynamic Routing Protocols on VXLANs

The NetScaler appliance supports IPv6 dynamic routing protocols for VXLANs. You can configure various IPv6 Dynamic Routing protocols (for example, OSPFv3, RIPng, BGP) on VXLANs from the VTYSH command line. An option IPv6 Dynamic Routing Protocol has been added to VXLAN command set for enabling or disabling IPv6 dynamic routing protocols on a VXLAN. After enabling IPv6 dynamic routing protocols on a VXLAN, processes related to the IPv6 dynamic routing protocols are required to be started on the VXLAN by using the VTYSH command line.

[From Build 55.23]

[# 472432]

The NetScaler appliance supports sending static IPv6 routes through a VXLAN. You can enable the NetScaler appliance to send an IPv6 route through either a VXLAN or a VLAN. A VXLAN parameter is added to the static IPv6 route command set.

[From Build 55.23]

[# 472443]

Layer 2 PBR Support for Forwarding Sessions

In earlier releases, Layer 2 information (for example, destination MAC address, source VLAN, and Interface ID) about packets related to forwarding sessions were ignored during a PBR lookup. In other words, any packet related to a forwarding session was not considered for matching against a PBR having Layer 2 parameters as its condition.

Now, layer 2 information about a packet related to a forwarding session is matched against layer 2 parameters in the configured PBRs.

This feature is useful in a scenario where packets related to a forwarding session must be processed by another device before being sent to their destination.

Following are the benefits of this support:

- Instead of defining new PBRs that are based on Layer 3 parameters, you can use existing PBRs based on Layer 2 parameters for sending the packets related to forwarding sessions to the desired next hop device.

- In a deployment that includes NetScaler appliances and optimization devices (for example, Citrix ByteMobile and Citrix CloudBridge appliances), PBRs based on Layer 2 parameters can be very handy compared to other, complex configuration for identifying the forwarding session related packets for PBR processing.

- Identifying egress packets, which also matched a forwarding session rule, from the optimization device for sending the packets to the desired next hop device.

[From Build 55.23]

[# 484458]

Logging HTTP Header Information

The NetScaler appliance can now log header information of HTTP requests related to an LSN configuration. The following header information of an HTTP request packet can be logged:

- URL that the HTTP request is destined to.

- HTTP Method specified in the HTTP request.

- HTTP version used in the HTTP request.

- IP address of the subscriber that sent the HTTP request.

An HTTP header log profile is a collection of HTTP header attributes (for example, URL and HTTP method) that can be enabled or disabled for logging. The HTTP header log profile is then bound to an LSN group. The NetScaler appliance then logs HTTP header attributes, which are enabled in the bound HTTP header log profile for logging, of any HTTP requests related to the LSN group.

An HTTP header log profile can be bound to multiple LSN groups but an LSN group can have only one HTTP header log profile.

[From Build 55.23]

[# 496835]

As-Override Support in Border Gateway Protocol

As a part of BGP loop prevention functionality, if a router receives a BGP packet containing the router's Autonomous System Number (ASN) in the Autonomous Systems (AS) path, the router drops the packet. The assumption is that the packet originated from the router and has reached the place from where it originated.

If an enterprise has several sites with a same ASN, BGP loop prevention causes the sites with an identical ASN to not get linked by another ASN. Routing updates (BGP packets) are dropped when another site receives them.

To solve this issue, BGP AS-Override functionality has been added to the ZebOS BGP routing module of the NetScaler.

With AS-Override enabled for a peer device, when the NetScaler appliance receives a BGP packet for forwarding to the peer, and the ASN of the packet matches that of the peer, the appliance replaces the ASN of the BGP packet with its own ASN number before forwarding the packet.

[From Build 55.23]

[# 503566]

Configuring Communication Intervals for an Active-Active Deployment

In an active-active deployment, all NetScaler nodes use the Virtual Router Redundancy Protocol (VRRP) to advertise their master VIP addresses and the corresponding priorities in VRRP advertisement packets (hello messages) at regular intervals.

VRRP uses the following communication intervals:

* Hello Interval-Interval between successive VRRP hello messages that a node sends, for all of its active (master) VIP addresses, to the other nodes of the VRRP deployment. For a VIP address, nodes on which the VIP address is in the inactive state use the hello messages as verification that the master VIP address is still UP.

* Dead Interval-Time after which a node of a backup VIP address considers the state of the master VIP address to be DOWN if VRRP hello messages are not received from the node that has the master VIP address. After the dead interval, the backup VIP address takes over and becomes the master VIP address.

You can change these intervals to a desired value on each node. They apply to all VIP addresses on that node.

[From Build 55.23]

[# 512843]

Changing the Priority of a VIP Address Automatically in an Active-Active Deployment

To ensure that a backup VIP address takes over as the master VIP before the node of the current master VIP address goes down completely, you can configure a node to change the priority of a VIP address on the basis of the states of the interfaces on that node. For example, the node reduces the priority of a VIP address when the state of an interface changes to DOWN, and increases the priority when the state of the interface changes to UP. This feature is configured on each node. It applies to the specified VIP addresses on the node.

To configure this feature on a node, you set the Reduced Priority (trackifNumPriority) parameter, and then associate the interfaces whose state is to be tracked for changing the priority of the VIP address. When any associated interface's state changes to DOWN or UP, the node reduces or increases the priority of the VIP address by the configured Reduced Priority (trackifNumPriority) value.

[From Build 55.23]

[# 512848]

GRE Payload Options in a GRE IP Tunnel

For a configured GRE IP tunnel, the NetScaler appliance encapsulates the entire Layer 2 packet, including the Ethernet header and the VLAN header (dot1q VLAN tag). IP GRE tunnels between NetScaler appliances and some 3rd party devices might not be stable, because these 3rd party devices are not programmed to process some or the Layer 2 packet headers.

To configure a stable IP GRE tunnel between a NetScaler appliance and a 3rd party device, you can use a new parameter with the GRE IP tunnel command set. You can set the GRE payload parameter to do one of the following before the packet is sent through the GRE tunnel:

- Carry the Ethernet header but drop the VLAN header

- Drop the Ethernet header as well as the VLAN header

- Carry the Ethernet header as well the VLAN header

[From Build 55.23]

[# 518397]

Specifying a VLAN in a Static ARP Entry

In a static ARP entry, you can specify the VLAN through which the destination device is accessible. This feature is useful when the interface specified in the static ARP entry is part of multiple tagged VLANs and the destination is accessible through one of the VLANs. The NetScaler appliance includes the specified VLAN ID in the outgoing packets matching the static ARP entry. If you don't specify a VLAN ID in an ARP entry, and the specified interface is part of multiple tagged VLANs, the appliance assigns the interface's native VLAN to the ARP entry.

For example, say NetScaler interface 1/2 is part of native VLAN 2 and of tagged VLANs 3 and 4, and you add a static ARP entry for network device A, which is part of VLAN 3 and is accessible through interface 1/2. You must specify VLAN 3 in the ARP entry for network device A. The NetScaler appliance then includes tagged VLAN 3 in all the packets destined to network device A, and sends them from interface 1/2.

If you don't specify a VLAN ID, the NetScaler appliance assigns native VLAN 2 for the ARP entry. Packets destined to device A are dropped in the network path, because they do not specify tagged VLAN 3, which is the VLAN for device A.

[From Build 55.23]

[# 520355]

Blocking Traffic on Internal Ports

The NetScaler appliance does not block traffic that matches an ACL rule if the traffic is destined to the appliance's NSIP address, or one of its SNIP addresses, and a port in the 3008-3011 range.

This behavior is now specified by the default setting of the new Implicit ACL Allow (implicitACLAllow) parameter (of the L3 param command). You can disable this parameter if you want to block traffic to ports in the 3008-3011 range. An appliance in a high availability configuration makes an exception for its partner (primary or secondary) node. It does not block traffic from that node.

To disable or enable this parameter by using the command line interface

At the command prompt, type:

> set l3param -implicitACLAllow [ENABLED|DISABLED]

Note: The parameter implicitACLAllow is enabled by default.

Example

> set l3param -implicitACLAllow DISABLED

Done

[From Build 55.23]

[# 529317]

Delaying Preemption

By default, a backup VIP address preempts the master VIP address immediately after its priority becomes higher than that of the master VIP. When configuring a backup VIP address, you can specify an amount of time by which to delay the preemption. Preemption delay time is a per-node setting for each backup VIP address.

The preemption delay setting for a backup VIP does not apply in the following conditions:

* The node of the master VIP goes down. In this case, the backup VIP takes over as the master VIP after the dead interval set on the backup VIP's node.

* The priority of the master VIP is set to zero. The backup VIP takes over as the master VIP after the dead interval set on the backup VIP's node.

For more information, see http://docs.citrix.com/en-us/netscaler/11/networking/interfaces/configuring-active-active-mode.html.

[From Build 64.34]

[# 553246]

Keeping a VIP address in the Backup State

You can force a VIP address to always stay in backup state in a VRRP deployment. This operation is helpful in maintenance or testing of the deployment.

When a VIP address is forced to stay in backup state, it does not participate in VRRP state transitions. Also, it cannot become master even if all other nodes go down.

To force a VIP address to stay in backup state, you set the priority of the associated VMAC address to zero. To ensure that none of the VIP addresses of a node handle traffic during a maintenance process on the node, set all the priorities to zero.

For more information, see http://docs.citrix.com/en-us/netscaler/11/networking/interfaces/configuring-active-active-mode.html.

[From Build 64.34]

[# 553311]

Optimization

Media classification support on the NetScaler appliance

You can now monitor and display the statistics of the media traffic going through the NetScaler appliance.

[From Build 55.23]

[# 493103]

Support for JPEG-XR image format in Front End Optimization (FEO)

The front end optimization feature now supports the conversion of GIF, JPEG, TIFF, and PNG images to JPEG-XR format as part of the image optimization functionality.

[From Build 55.23]

[# 504044]

Support for WebP image format in Front End Optimization (FEO)

The front end optimization feature now supports the conversion of GIF, JPEG, and PNG images to WEBP format as part of the image optimization functionality.

[From Build 55.23]

[# 509338]

Platform

Support for New Hardware Platforms

The MPX 25100T and MPX 25160T platforms are now supported in this release. For more information about these platforms, see http://docs.citrix.com/en-us/netscaler/11/netscaler-hardware-installation/netscaler-hardware-platforms/mpx-25100t-25160t.html.

[From Build 55.23]

[# 486703, 495591, 552218]

M4 EC2 Instance Support on Amazon AWS

In the Amazon AWS cloud, a NetScaler AMI can now be launched as an M4 EC2 instance. Some of the features of M4 EC2 instance type are:

* 2.4 GHz Intel Xeon E5-2676 v3 (Haswell) processors

* EBS-optimized by default at no additional cost

* Balance of compute, memory, and network resources

Note: A NetScaler AMI running as an M4 EC2 instance supports all M4 EC2 features except the enhanced networking features. For more information about M4 EC2 instance types, see https://aws.amazon.com/ec2/instance-types/.

[From Build 65.35]

[# 618107]

Support for VMXNET3 interfaces on NetScaler VPX Appliance in VMware ESX

For performance information of SR-IOV interface on ESX, refer the latest VPX datasheet.

For information on how to configure SR-IOV interfaces on NetScaler VPX Appliance, see http://docs.citrix.com/en-us/netscaler/11-1/deploying-vpx/install-vpx-on-esx/configure-sr-iov.html.

[From Build 68.11]

[# 637341]

The single bundle images provided in this release support the NetScaler SDX 14000 FIPS platform and include platform and Management Service support for the NetScaler SDX 14xxx FIPS appliances.

Note: The NetScaler VPX image provided in this release does not support FIPS devices. If you want to use NetScaler VPX with FIPS, you can use the following NetScaler VPX images with the single bundle images provided in this release for the NetScaler SDX 14000 FIPS platform:

You can send larger data payload through each frame, which makes data transmission more efficient. To enable Jumbo Frames, use NetScaler CLI, GUI, or NITRO API.

[From Build 69.123]

[# 658197]

Policies

Policy extensions support on NetScaler appliance

The NetScaler appliance now supports policy extensions, which you can use to add customized functions to default syntax policy expressions. An extension function can accept text, double, Boolean or number values as input, perform a computation, and produce a text, double, Boolean or number result.

[From Build 55.23]

[# 248822]

Transaction Scope Variables

Transaction scope variables are added to variables feature. You can now use transaction scope variables to specify separate instances with values for each transaction processed by the NetScaler appliance. Transaction variables are useful for passing information from one phase of the transaction to another. For example, you can use a transaction variable to pass information about the request onto the response processing.

[From Build 55.23]

[# 444109]

SSL

Support for Auto-Detection of the Certificate-Key Pair Format

The NetScaler software has been enhanced to automatically detect the format of the certificate-key pair. To do so, the format of the certificate and key file should be the same. If you specify the format in the inform parameter, it is ignored by the software. Supported formats are PEM, DER, and PFX.

[From Build 55.23]

[# 209047, 432330, 481660]

Changes to the Default Cipher Suite

If user-defined ciphers or cipher groups are not bound to an SSL virtual server, the DEFAULT cipher group is used for cipher selection at the front end and the ALL cipher group is used for cipher selection at the back end. In this release, the predefined cipher suites, such as DEFAULT and ALL, are modified to give strong ciphers a higher priority. For example, earlier RC4-MD5 was given a higher priority but it is deprioritized in the new list because it is a weak cipher.

[From Build 55.23]

[# 226713, 258311, 384491]

Support for SNI with a SAN Extension Certificate

The NetScaler appliance now supports SNI with a SAN extension certificate. During handshake initiation, the host name provided by the client is first compared to the common name and then to the subject alternative name. If the name matches, the corresponding certificate is presented to the client.

[From Build 55.23]

[# 250573]

New Counters in SSL Statistics

Because TLS 1.1 and 1.2 are becoming the primary security protocols, the transaction and session statistics for these protocols are now included in the SSL statistics.

[From Build 64.34]

[# 336395, 559165, 560353]

Using the SSL Chip Utilization Percentage Counter for Capacity Planning on MPX Appliances that use N3 Chips

Knowing the percentage utilization of all the SSL chips in an appliance over a period of time helps in capacity planning. The counter increments every 7 seconds and therefore provides real-time data, which can help you predict when an appliance is likely to reach capacity.

Note: This feature is available on only the MPX appliances that use N3 chips, which include MPX 11515/11520/11530/11540/11542 and MPX 220140/22060/22080/22100/22120/24100/24150 appliances.

Some models of MPX 14020/14030/14040/14060/14080/14100 and MPX 25100/25160/25200, which use N3 chips, also support this feature.

[From Build 65.35]

[# 416807, 197702]

Using the SSL Chip Utilization Percentage Counter for Capacity Planning on MPX Appliances that use N3 Chips

Knowing the percentage utilization of all the SSL chips in an appliance over a period of time helps in capacity planning. The counter increments every 7 seconds and therefore provides real-time data, which can help you predict when an appliance is likely to reach capacity.

Note: This feature is available on only the MPX appliances that use N3 chips, which include MPX 11515/11520/11530/11540/11542 and MPX 220140/22060/22080/22100/22120/24100/24150 appliances.

Some models of MPX 14020/14030/14040/14060/14080/14100 and MPX 25100/25160/25200, which use N3 chips, also support this feature.

[From Build 64.34]

[# 416807, 197702]

Support for TLS Protocol Version 1.1 and 1.2 on the front end on the NetScaler VPX and SDX Appliances

The NetScaler VPX appliance now supports TLS protocol versions 1.1 and 1.2 on the front end. On an SDX appliance, TLSv1.1/1.2 are supported on the front end even if an SSL chip is not assigned to the VPX instance.

[From Build 55.23]

[# 424463, 481970]

Support for Checking the Subject Alternative Name in addition to the Common Name in a Server Certificate

If you configure a common name on an SSL service or service group for server certificate authentication, the subject alternative name (SAN), if specified, is matched in addition to the common name. Therefore, if the common name does not match, the name that you specify is compared to the values in the SAN field in the certificate. If it matches one of those values, the handshake is successful. Note that in the SAN field, only DNS names are matched.

[From Build 55.23]

[# 439161]

Support for Thales nShield(R) HSM

All NetScaler MPX, SDX, and VPX appliances except the MPX 9700/10500/12500/15500 appliances now support the Thales nShield(R) Connect external Hardware Security Module (HSM). With a Thales HSM, the keys are securely stored as application key tokens on a remote file server and can be reconstituted only inside the Thales HSM. Thales HSMs comply with FIPS 140-2 Level 3 specifications.

Thales integration with the ADC is supported for TLS versions 1.0, 1.1, and 1.2.

For more information about support for Thales nShield(R) HSM, see http://docs.citrix.com/en-us/netscaler/11/traffic-management/ssl/support_for_thales.html.

[From Build 62.10]

[# 440351, 477544]

New SNMP OIDs for SSL transactions per second

The following SNMP OIDs have been added to the display the SSL transactions per second:

NS-ROOT-MIB::sslTotTransactionsRate.0 = Gauge32: 0

NS-ROOT-MIB::sslTotSSLv2TransactionsRate.0 = Gauge32: 0

NS-ROOT-MIB::sslTotSSLv3TransactionsRate.0 = Gauge32: 0

NS-ROOT-MIB::sslTotTLSv1TransactionsRate.0 = Gauge32: 0

[From Build 55.23]

[# 449923]

2048-bit Default Certificates on the NetScaler VPX Instance

You no longer need a license on your VPX instance to generate a 2048-bit default certificate. After upgrading your VPX instance to release 11.0, if you want to replace the old internal default 512-bit certificate, delete all your old certificate-key pairs that have "ns-" as the first three characters, and then restart the instance to automatically generate a 2048-bit default certificate.

With this release, the default certificate on a NetScaler appliance is 2048-bits. In earlier builds, the default certificate was 512-bits or 1024-bits. After upgrading to release 11.0, you must delete all your old certificate-key pairs starting with "ns-", and then restart the appliance to automatically generate a 2048-bit default certificate.

[From Build 55.23]

[# 451441, 405363, 458905, 465280, 540467, 551603, 559154]

Support for Displaying the Hex Code of a CIpher

The show ciphersuite command now displays the IETF standard hexadecimal code of the cipher. It is helpful in debugging, because a hex code is unique to a cipher but the cipher name might differ on the NetScaler appliance, OpenSSL, and Wireshark.

Two counters have been added to the output of the "stat ssl vserver" command as follows:

1. ssl_ctx_tot_clientAuth_success-Tracks the number of successful client authentications for each SSL virtual server.

2. ssl_ctx_tot_clientAuth_failures-Tracks the number of failed client authentications for each SSL virtual server.

[From Build 65.35]

[# 492684]

Support for TLS Protocol Version 1.1 and 1.2 on the backend on the NetScaler MPX, MPX-FIPS, and SDX Appliances

The NetScaler MPX appliance now supports TLS protocol versions 1.1 and 1.2 on the backend. MPX-FIPS appliances running firmware version 2.2 also support TLSv1.1/1.2 on the backend. On an SDX appliance, TLSv1.1/1.2 is supported on the backend only if an SSL chip is assigned to the VPX instance.

[From Build 55.23]

[# 494082, 566364]

DH Key Performance Optimization

DH key generation is optimized on a VPX appliance by adding a new parameter dhKeyExpSizeLimit. You can set this parameter on an SSL virtual server or on an SSL profile and bind the profile to the SSL virtual server. The key generation is optimized as defined by NIST in http://csrc.nist.gov/publications/nistpubs/800-56A/SP800-56A_Revision1_Mar08-2007.pdf. Additionally, the minimum DH count is set to zero. As a result, you can now generate a DH key for each transaction as opposed to a minimum of 500 transactions earlier. This helps to achieve perfect forward secrecy (PFS).

[From Build 55.23]

[# 498162, 512637]

The NetScaler VPX appliance now supports AES-GCM/SHA2 ciphers on the front end.

[From Build 65.35]

[# 498207]

Support for Additional Ciphers on a DTLS Virtual Server

EDH, DHE, ADH, EXP, and ECDHE ciphers are now supported on a DTLS virtual server.

[From Build 55.23]

[# 508440, 483391]

Support for TLS_FALLBACK_SCSV signaling cipher suite value

The NetScaler appliance now supports the TLS_FALLBACK_SCSV signaling cipher suite value. The presence of this SCSV extension in the Client Hello indicates that the client is retrying to connect to the server by using a lower SSL version, after its previous attempt to communicate with a higher version failed. Therefore, if the server finds this extension in Client Hello and also finds that the client is proposing a version that is lower than the maximum version supported by the server, it is a likely indication of a "man in the middle attack." The server drops these handshakes.

For more information, see http://docs.citrix.com/en-us/netscaler/11/traffic-management/ssl/customize-ssl-config/config-protocol-settings.html.

[From Build 55.23]

[# 509666, 573528]

Support for ECDHE Ciphers at the Back End

The NetScaler appliance now supports the following ECDHE ciphers at the back end:

- TLS1-ECDHE-RSA-RC4-SHA

- TLS1-ECDHE-RSA-DES-CBC3-SHA

- TLS1-ECDHE-RSA-AES128-SHA

- TLS1-ECDHE-RSA-AES256-SHA

Note: This feature is available only for NetScaler MPX platforms.

[From Build 55.23]

[# 523464]

Graceful Cleanup of SSL sessions after change in any SSL entity parameter

Some operations - for example, updating a certificate to replace a potentially exposed certificate, using a stronger key (2048-bit instead of 1024-bit), adding/removing a certificate from a certificate chain, or changing any of the SSL parameters - should clean the SSL sessions gracefully instead of abruptly terminating existing sessions. With this enhancement, existing connections continue to use the current settings but all new connections use the new certificate or settings. However, connections that are in the middle of a handshake or sessions that are renegotiating are terminated, and session reuse is not allowed. To clear the sessions immediately after a configuration change, you must disable and reenable each entity.

[From Build 64.34]

[# 529979]

Stricter Control on Client Certificate Validation

You can configure the SSL virtual server to accept only client certificates that are signed by a CA certificate bound to the virtual server. To do so, enable the ClientAuthUseBoundCAChain setting in the SSL profile bound to the virtual server.

For more information, see http://docs.citrix.com/en-us/netscaler/11/traffic-management/ssl/config-ssloffloading/ssl-profiles.html.

[From Build 55.23]

[# 533241]

Enhanced SSL Profile

The SSL infrastructure on the NetScaler appliance is continually updated to address the ever growing requirements for security and performance. Vulnerabilities in SSLv3 and RC4 implementation have emphasized the need to use the latest ciphers and protocols to negotiate the security settings for a network connection. Implementing any changes to the configuration, such as disabling SSLv3, across thousands of SSL end points is a cumbersome process. Therefore, settings that were part of the SSL end points configuration have been moved to the SSL profile, along with the default ciphers. To implement any change in the configuration, including cipher support, you need only modify the profile. If the profile is enabled, the change is immediately reflected in all the end points that the profile is bound to.

Important: After the upgrade, if you enable the profile, you cannot reverse the changes. That is, the profile cannot be disabled.

[From Build 64.34]

[# 533640]

The NetScaler VPX appliance now supports TLS protocol versions 1.1 and 1.2 on the back end.

[From Build 65.35]

[# 543526, 579749, 619662]

If you downgrade the software on your NetScaler appliance that does not have a license to release 9.3 build 61.66 or earlier, some commands related to the default server certificate might not be saved in the running configuration. As a result, after restarting, secure access (HTTPS) to the appliance fails.

[From Build 64.34]

[# 551603, 559154]

The NetScaler appliance now supports the following "signature algorithms" extensions in the back end client hello message:

- RSA-MD5

- RSA-SHA1

- RSA-SHA256

[From Build 65.35]

[# 600155, 601059]

System

The NetScaler Web Logging (NSWL) client logs a hyphen (-) instead of a user name when %u is specified in the log format.

[From Build 55.23]

[# 238440, 239481, 247372, 422873]

User configurable congestion window for TCP profile

You can now set the maximum congestion window size for a TCP profile on the NetScaler appliance.

[From Build 55.23]

[# 248711]

Call home support for NetScaler VPX models

Call home support has been added to NetScaler VPX models 1000 and higher.

[From Build 55.23]

[# 311620]

Specifying a domain name for a logging server

When configuring an auditlog action, you can specify the domain name of a syslog or nslog server instead of its IP address. Then, if the server's IP address changes, you do not have to change it on the NetScaler appliance.

You can now specify the minimum number of reuse pool connections to be opened from the NetScaler appliance to a particular server. This setting helps in optimal memory utilization and reduces the number of idle connections to the server.

[From Build 55.23]

[# 397478]

Support for FACK on TCP profiles

The TCP profiles on a NetScaler appliance now support forward acknowledgement (FACK). FACK avoids TCP congestion by explicitly measuring the total number of data bytes outstanding in the network, and helping the sender (either a NetScaler ADC or a client) control the amount of data injected into the network during retransmission timeouts.

[From Build 55.23]

[# 439130]

NTP Version Update

In NetScaler release 11, the NTP version has been updated from 4.2.6p3 to 4.2.8p2.

If you upgrade your NetScaler appliance from any earlier release to release 11, the NTP configuration is automatically upgraded with additional security policies. For more information about configuring an NTP server, see http://docs.citrix.com/en-us/netscaler/11/system/basic-operations/configuring-clock-sychronization.html.

[From Build 55.23]

[# 440375, 440591]

During the execution of the "nstrace.sh" script (from shell) or the "start nstrace" command (from CLI), when the trace file is rolled over, some packets might not be available in the trace. The number of packets that will be dropped from the trace is directly proportional to the traffic rate.

[From Build 55.23]

[# 480258, 494482, 523853]

Showtechsupport utility enhancement

If your NetScaler appliance has Internet connectivity, you can now directly upload the newly generated collector archive to the Citrix technical support server from the appliance.

Support for milliseconds, microseconds, and nanoseconds in Time Format Definition table

You can now configure NetScaler web logging clients to capture transaction times in milliseconds, microseconds, and nanoseconds for logging on the NetScaler appliance.

[From Build 55.23]

[# 505840, 505377]

One Perl script to support both call home and regular uploads

The script used to upload collector archives to Citrix servers is now packaged as part of the official NetScaler build (collector_upload.pl). However, using this script directly is not recommended. Instead, use the -upload option in showtechsupport utility to upload the archives.

[From Build 55.23]

[# 525332]

Support for MPTCP Version Negotiation

A client can now establish an MPTCP connection with NetScaler appliance even if the client's and the NetScaler appliance's MPTCP versions does not match. If the MPTCP version of the client is higher than the one supported on the appliance, the client falls back to a lower or equal version. If the appliance supports that version, the MPTCP session continues. Otherwise, the appliance falls back to a normal TCP session.

[From Build 64.34]

[# 529883]

Support for Configuring a Proxy Server to Install Licenses

You no longer have to configure internet connectivity on the NetScaler appliance in order to use a hardware serial number or license activation code to allocate a NetScaler license. Instead, you can use a proxy server.

On the NetScaler GUI, navigate to Configuration > System > Licenses > Manage Licenses > Add a New License, select the Connect through Proxy Server check box, and specify the IP address and port of your proxy server.

[From Build 64.34]

[# 541474]

The NetScaler introduces a new role called sysadmin. A sysadmin is lower than a superuser is terms of access allowed on the appliance. A sysadmin user can perform all NetScaler operations with the following exceptions: no access to the NetScaler shell, cannot perform user configurations, cannot perform partition configurations, and some other configurations as stated in the sysadmin command policy.

[From Build 55.23]

[# 548516]

Support restore operation on the NetScaler Appliance by using a remotely stored backup

You can now use a remotely saved backup to restore a NetScaler appliance through the "add system backup <filename>", that adds the metadata to the remote backup package, so that the restore operation can successfully use the backup package.

[From Build 64.34]

[# 569974]

The NetScaler appliance fails intermittently when trace is started in 'RX' mode.

[From Build 55.23]

[# 576067]

You can now enable auto-bootstrapping on a NetScaler VPX or NetScaler 1000v instance running on Hyper-V, by attaching a DVD ROM with an appropriate ISO file to the instance before booting it up.

[From Build 65.35]

[# 578451]

The tech support bundle that is generated for a NetScaler MPX appliance that has a LOM port, generates a list of LOM sensors and stores this list in the support bundle in the "shell/ipmitool_sensor_list.out" file.

[From Build 64.34]

[# 596315]

Telco

Provide Internet Access to a Large Number of Private IPv4 Subscribers of a Telecom Service Provider (Large Scale NAT)

The Internet's phenomenal growth has resulted in a shortage of public IPv4 addresses. Large Scale NAT (LSN/CGNAT) provides a solution to this issue, maximizing the use of available public IPv4 addresses by sharing a few public IPv4 addresses among a large pool of Internet users. LSN translates private IPv4 addresses into public IPv4 addresses. It includes network address and port translation methods to aggregate many private IP addresses into fewer public IPv4 addresses. LSN is designed to handle NAT on a large scale.

The NetScaler supports LSN and is compliant with RFC 6888, 5382, 5508, and 4787. The NetScaler LSN feature is very useful for Internet Service Providers (ISPs) and carriers providing millions of translations to support a large number of users (subscribers) and at very high throughput. The LSN architecture of an ISP using Citrix products consists of subscribers (Internet users) in private address spaces accessing the Internet through a NetScaler appliance deployed in ISP's core network.

The following lists some of the LSN features supported on a NetScaler appliance:

For more information about the Large Scale NAT feature, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-introduction.html.

[From Build 62.10]

[# 316909]

Support for Gx Interface

The NetScaler appliance can now dynamically receive the subscriber information over a Gx interface. The appliance communicates with the PCRF server over the Gx interface, receives the subscriber information, and uses this information to direct the flow of traffic. The PCRF server can send updates over this interface at any point during the subscriber session.

For more information about Gx interface, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-telco-subscriber-management.html.

[From Build 62.10]

[# 402469]

Subscriber-Aware Traffic Steering

Traffic steering is directing subscriber traffic from one point to another based on subscriber information. When a subscriber connects to the network, the packet gateway associates an IP address with the subscriber and forwards the data packet to the NetScaler appliance. The appliance communicates with the PCRF server over the Gx interface to get the policy information. Based on the policy information, the appliance performs one of the following actions:

- Forwards the data packet to another set of services

- Drops the packet

- Performs LSN if configured on the appliance

For more information about subscriber-aware traffic steering, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-telco-subscriber-management.html.

[From Build 62.10]

[# 402473]

Provide Internet Access to IPv4 Subscribers Through the IPv6 Core Network of a Telecom Service Provider (Dual-Stack Lite)

Because of the shortage of IPv4 addresses, and the advantages of IPv6 over IPv4, many ISPs have started transitioning to IPv6 infrastructure. But during this transitioning, ISPs must continue to support IPv4 along with IPv6 because most of the public Internet still uses only IPv4, and many subscribers do not support IPv6.

Dual-Stack Lite (DS-Lite) is an IPv6 transition solution for ISPs with IPv6 infrastructure to connect their IPv4 subscribers to the Internet. DS-Lite uses IPv6 tunneling to send a subscriber's IPv4 packet over a tunnel on the IPv6 access network to the ISP. The IPv6 packet is de capsulated to recover the subscriber's IPv4 packet and is then sent to the Internet after NAT address and port translation other LSN related processing. The response packets traverse through the same path to the subscriber.

The NetScaler appliance implements the AFTR component of a DS-Lite deployment and is compliant with RFC 6333.

For more information about the DS-Lite feature, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/dual-stack-lite.html.

[From Build 62.10]

[# 407162]

Provide Visibility into SLA Reports

An ISP often purchases international bandwidth from upstream ISPs, who then become layer 2 ISPs. To provide the redundancy required for reliable service to its customers, the purchasing ISP negotiates Service Level Agreements with multiple layer 2 ISPs. The SLAs stipulate a penalty in the event that the layer 2 ISP fails to maintain a specified level of service.

NetScaler Insight Center and the NetScaler cache redirection feature can now be used to monitor the traffic flowing through the NetScaler appliances and calculate SLA breaches. The NetScaler cache redirection feature helps save bandwidth over international links. NetScaler Insight Center works with the NetScaler cache redirection feature to calculate, and provide visibility into, the percentage of bandwidth saved and any breaches of the SLA. ISP administrators are alerted whenever there is a breach for response time, hit rate/sec, or bandwidth.

For a specific domain, NetScaler calculates the following SLA breaches and forwards the data to NetScaler Insight Center:

* SLA Breach. A breach that occurs when a metric (response time, hits, or bandwidth) crosses the defined threshold value. For example, SLA breach is considered if the response time for a specific domain crosses 100 ms.

* SLA Breach Duration. Time period in which a SLA breach lasted. For example, SLA Breach Duration is considered 5 mins, if the response time for a domain is greater than 100 ms consistently for 5 mins.

* Breached Request Percentage. Percentage of requests whose response time is not within the minimum response time and maximum response time range. For example, if you configure this value as 10%, then among 100 requests, the response time of 10 requests are not within the minimum response time and maximum response time.

NetScaler Insight Center then calculates the following SLA breaches:

* SLA Breach Frequency- SLA Breach Frequency is the defined as the number of times the SLA breach occurs for the SLA Breach Duration. For example, SLA Breach Frequency is considered 1, if the response time for a domain is greater than 100 ms consistently for 5 mins.

All of these metrics are calculated for a SLA group, which contains a list of domains defined by the ISP administrator.

[From Build 62.10]

[# 495288, 501269, 501277, 501278, 501279, 501280]

Support for RADIUS Accounting Message

The NetScaler appliance can now dynamically receive the subscriber information through a RADIUS accounting message. It receives the subscriber IP address and MSISDN and uses this information to retrieve the subscriber rules from the PCRF server.

For more information about RADIUS Accounting Message, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-telco-subscriber-management.html.

[From Build 62.10]

[# 526981]

Configuring DS-Lite Static LSN Maps

The NetScaler appliance supports manual creation of DS-Lite LSN mappings, which contain the mapping between the following information:

Static DS-Lite LSN mappings are useful in cases where you want to ensure that the connections initiated to a NAT IP address and port map to the subscriber IP address and port through the specified B4 device (for example, web servers located in the internal network).

For more information, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/dual-stack-lite.html.

[From Build 64.34]

[# 558406]

Subscriber-Aware Service Chaining

Service chaining is determining the set of services through which the outbound traffic from a subscriber must pass before going to the Internet. Multiple services, such as antivirus services, parental control services, firewalls, and web filter, are running in a Telco network. Different subscribers have different plans and each plan has specific services associated with it. The decision to direct a subscriber's request to a service is based on the subscriber information. Instead of sending all the traffic to all the services, the NetScaler appliance intelligently routes all requests from a subscriber to a specific set of services on the basis of the policy defined for that subscriber. The appliance receives the subscriber information from the PCRF over a Gx interface.

For more information about subscriber-aware service chaining, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-telco-subscriber-management.html.

[From Build 62.10]

[# 561747]

IPv6 Prefix based Subscriber Sessions

A telco user can be uniquely identified by the IPv6 prefix rather than the complete IPv6 address. The NetScaler appliance now uses the prefix instead of the complete IPv6 address (/128) to identify a subscriber in the database (subscriber store). For communicating with the PCRF server (for example, in a CCR-I message), the appliance now uses the framed-IPv6-Prefix AVP instead of the complete IPv6 address. The default prefix length is /64, but you can configure the appliance to use a different value.

[From Build 64.34]

[# 574135]

Idle Session Management of Subscriber Sessions in a Telco Network

Subscriber-session cleanup on the NetScaler appliance is based on control plane events, such as a RADIUS Accounting Stop message, a Diameter RAR (session release) message, or a "clear subscriber session" command. In some deployments, the messages from a RADIUS client or a PCRF server might not reach the appliance. Additionally, during heavy traffic, the messages might be lost. A subscriber session that is idle for a long time continues to consume memory and IP resources on the appliance. The idle session management feature provides configurable timers to identify idle sessions, and cleans up these sessions on the basis of the specified action.

[From Build 64.34]

[# 574138]

High Availability Support for Dynamic Subscriber Sessions

In the absence of a high availability (HA) setup, the subscriber information that is received from the RADIUS client is lost if the appliance fails. With HA support, the subscriber sessions are continually synchronized on the secondary node. In the event of a failover, the subscriber information is still available on the secondary node.

[From Build 63.16]

[# 574838]

Subscriber Session Event Logging

The NetScaler appliance currently maintains millions of subscriber sessions in its database (subscriber store) but does not log these messages. Telco administrators need reliable log messages to track the control plane messages specific to a subscriber. They also need historical data to analyze subscriber activities. The appliance now supports logging of RADIUS control plane accounting messages and Gx control plane logging messages. Some of the key attributes are MSISDN and time stamp. By using these logs, you can track a user by using the IP address, and the MSISDN if available.

[From Build 64.34]

[# 575621, 575623]

Port Block Size in a Large Scale NAT Configuration

Deterministic NAT and Dynamic NAT with port block allocation significantly reduce the LSN log volume. For these two types of configuration, the NetScaler appliance allocates a NAT IP address and a block of ports to a subscriber.

The minimum port block size for deterministic LSN configuration and dynamic LSN configuration with port block has been reduced from 512 ports to 256. This reduction of the minimum port block doubles the maximum number of subscribers for a NAT IP address in an LSN configuration. It also reduces the number of unused ports assigned to subscribers who do not need more than 256 ports at a time.

The port block size parameter can be set while adding or modifying an LSN group as part of an LSN configuration. A value of 256 (default) or a multiple of 256 can be set to the port block size parameter.

For instructions on configuring Large Scale NAT, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-introduction/configuration-steps-lsn.html.

For sample LSN configurations, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-introduction/lsn-sample-configurations.html.

[From Build 64.34]

[# 581285]

Logging MSISDN Information for a Large Scale NAT configuration

A Mobile Station Integrated Subscriber Directory Number (MSISDN) is a telephone number uniquely identifying a subscriber across multiple mobile networks. The MSISDN is associated with a country code and a national destination code identifying the subscriber's operator.

You can configure a NetScaler appliance to include MSISDNs in LSN log entries for subscribers in mobile networks. The presence of MSISDNs in the LSN logs helps the administrator in faster and accurate back tracing of a mobile subscriber who has violated a policy or law, or whose information is required by lawful interception agencies.

For more information, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/lsn-introduction/lsn-monitoring.html.

[From Build 64.34]

[# 581315, 502083]

Deterministic NAT Allocation for DS-Lite

Deterministic NAT allocation for DS-Lite LSN deployments is a type of NAT resource allocation in which the NetScaler appliance pre-allocates, from the LSN NAT IP pool and on the basis of the specified port block size, an LSN NAT IP address and a block of ports to each subscriber (subscriber behind B4 device).

The appliance sequentially allocates NAT resources to these subscribers. It assigns the first block of ports on the beginning NAT IP address to the beginning subscriber IP address. The next range of ports is assigned to the next subscriber, and so on, until the NAT address does not have enough ports for the next subscriber. At that point, the first port block on the next NAT address is assigned to the subscriber, and so on.

The NetScaler appliance logs the allocated NAT IP address and the port block for a subscriber. For a connection, a subscriber can be identified by just its mapped NAT IP address and port block. For this reason, the NetScaler appliance does not log the creation or deletion of an LSN session.

For more information, see http://docs.citrix.com/en-us/netscaler/11/solutions/netscaler-support-for-telecom-service-providers/dual-stack-lite.html.

[From Build 64.34]

[# 582325]

IP Prefix NAT

The NetScaler appliance supports translating a part of the source IP address instead of the complete address of packets received on the appliance. IP prefix NAT includes changing one or more octets or bits of the source IP address.

The NetScaler appliance supports IP prefix NAT for traffic related to virtual servers and services for which the NetScaler does not maintain any session information. For example, virtual servers and services of type ANY, UDP, and DNS.

IP prefix NAT is useful in a deployment of NetScaler appliances and optimization devices (for example, Citrix ByteMobile) for identifying traffic from different client networks, which share the same network address, for meeting different optimization needs for traffic from each client network.

For more information, see http://docs.citrix.com/en-us/netscaler/11/networking/ip-addressing/configuring-network-address-translation/Partial-Nat.html

[From Build 64.34]

[# 590571]

Fixed Issues in Previous NetScaler 11.0 Releases

The issues that were addressed in NetScaler 11.0 releases prior to Build 72.16. The build number provided below the issue description indicates the build in which this issue was addressed.

AAA-TM

When IBM Tivoli IdP is used for SAML authentication with NetScaler appliance as the service provider, there could be an issue with SAML assertion verification.

[From Build 64.34]

[# 540396]

When kerberos token decryption fails, the NetScaler appliance responds with a 200 response with error message, instead of sending a 401 response.

[From Build 64.34]

[# 567233, 593994]

The status of a LDAP server on the authentication dashboard of the NetScaler GUI, will be shown as UP, regardless of the actual status of the LDAP server, for the following combinations:

- Security type is SSL and port is 389.

- Security type is TLS or PLAINTEXT and port is 636.

[From Build 64.34]

[# 567376, 567379, 592941]

The "show aaa session" command causes a high level of CPU usage when executed with the "-username" or "-group" option.

[From Build 63.16]

[# 577778, 595104, 595185]

On a NetScaler MPX-FIPS appliance, the AAA module becomes unresponsive if the configured RADIUS or TACACS policies are triggered. So, from this build onwards, RADIUS and TACACS policies are not supported on MPX-FIPS appliances.

Note: RADIUS and TACACS are not FIPS compliant protocols.

[From Build 65.35]

[# 591399]

You cannot enter the FQDN for a RADIUS or LDAP server by using the NetScaler GUI.

[From Build 65.35]

[# 596382, 618884]

Single sign-on to server does not succeed when native clients, such as iOS clients, connect to the NetScaler appliance using Active Sync protocol and send cookies along with authorization header.

[From Build 64.34]

[# 597221]

The Netscaler appliance intermittently fails if a user accesses a very long URL without proper AAA context.

[From Build 65.35]

[# 598837]

If the AAA virtual server is configured to an non-ActiveDirectory LDAP server, and an invalid password is used to logon, the NetScaler appliance becomes unresponsive.

[From Build 64.34]

[# 599264, 610045]

The NetScaler appliance might become unresponsive if the persistence cookie feature is enabled in AAA-TM deployments.

[From Build 64.34]

[# 599701, 607138, 608997]

In a multi-core NetScaler environment, user sessions sometimes do not get terminated if the decision to terminate is based on a force timeout value that is configured on a TM traffic action.

[From Build 65.35]

[# 610604, 618760, 623053]

In a multi-core NetScaler environment, user sessions sometimes do not get terminated if the decision to terminate is based on a force timeout value that is configured on a TM traffic action.

[From Build 69.123]

[# 610604, 618760]

When RADIUS is used in nFactor authentication, the NetScaler appliance fails to complete the request if user is prompted for password change.

[From Build 65.35]

[# 612431]

When the NetScaler appliance is configured as SAML Service Provider (SP), the SAML Identity Provider (IdP) dishonors a logout request that is performed on the traffic management virtual server (load balancing or content switching) that uses a AAA-TM traffic policy.

This happens because the NetScaler SP sends to the SAML IdP a SAML logoutRequest that contains "Conditions" XML tag.

[From Build 65.35]

[# 613700]

Authentication fails if the server name in an LDAP action is changed from an FQDN to an IP address by using the "set ldapaction" command.

[From Build 65.35]

[# 614597]

If you are using AAA-TM on an HTTP virtual server with no endpoint features enabled, the acknowledgement from the NetScaler appliance might not contain all the data that the client sent. This might cause some page elements to not load completely, or to time out.

[From Build 65.35]

[# 615885]

The NetScaler appliance fails if authentication is disabled while user authentication is in progress.

[From Build 67.12]

[# 617370]

If you add a Negotiate Server with a Keytab file with a GUI, an error is issued: "Error in retrieving file. Directory does not exist." The error is only issued when it is executed within partition.

[From Build 66.11]

[# 620774]

If a logout message from a session owner to a cached session is dropped, the NetScaler appliance might fail while trying to resend the message.

[From Build 65.35]

[# 620948]

If SAML authentication is used to log on a user, and the SAML action is removed while there are active sessions, addition of a high availability node might cause occasional failures on the secondary node.

[From Build 67.12]

[# 621787]

If AAA-TM logout is configured through a traffic policy on the Netscaler appliance, and the server sends a chunked response, the user encounters an error.

[From Build 66.11]

[# 623005]

In a high availability setup, a session does not time out even if a force timeout is configured on a traffic action that is bound to a load balancing or content switching virtual server and a force fail over is performed.

[From Build 69.123]

[# 623053]

You cannot add an authentication virtual server as the target of a content switching virtual server in a partition.

[From Build 66.11]

[# 624063]

When doing forms based SSO, if the back-end server sets a cookie with the login form, NetScaler does not send those cookies to the client. This behavior was observed after a successful forms SSO attempt. This applies to forms based SSO access in both Gateway and AAA-TM products.

[From Build 66.11]

[# 624165]

If you use the Kerberos protocol for single sign-on (SSO) to access a back-end server, the NetScaler appliance might fail if heavy traffic causes allocation failures, because the appliance might detect a call to free memory that has already been freed.

[From Build 67.12]

[# 637125, 649410]

If SAML authentication is configured on NetScaler with artifact binding but certificates are not configured correctly in the SAML action, NetScaler fails to send the artifact resolution request to the Identity Provider.

[From Build 69.123]

[# 641913]

In rare cases, the NetScaler appliance dumps core and restarts if RADIUS accounting is enabled.

[From Build 69.123]

[# 648633, 659976]

The NetScaler appliance might restart if role-based access is enabled in admin partitions.

[From Build 69.123]

[# 653702]

If the LDAP bind account password used on a NetScaler appliance contains the "at" special character (@), test connection performed on LDAP server fails, and the dashboard shows that the LDAP server is down.

[From Build 71.24]

[# 654375, 689891, 659392]

The NetScaler appliance fails if all of the following conditions are met:

- The appliance is used as a SAML service provider.

- Multiple load balancing and content switching virtual servers are configured for the same external identity provider (IdP) but with different FQDN.

- SAML login happens on a virtual server with an existing SAML session from the same IdP.

[From Build 69.123]

[# 664171]

An attempt to change an LDAP password through the NetScaler Gateway virtual server fails if the new password includes any multibyte UTF-8 characters, such as German umlauts (for example, kölnbonn207), Latin small letter sharp s (for example, straße2017), or special characters (for example, &%$§1Lucie-Marie).

[From Build 71.24]

[# 672846, 691269]

A NetScaler appliance connected to a back-end LDAP server logs an incorrect error code for the “restricted logon hours” parameter in the NetScaler AAA daemon logs

[From Build 71.24]

[# 676697]

NTLM authentication fails when the NetScaler tries to negotiate with an LB virtual server in front of the NTLM server.

[From Build 71.24]

[# 677747]

In rare scenarios, a NetScaler appliance becomes unresponsive when both nodes of a high availability (HA) setup claim to be the primary node.

[From Build 71.24]

[# 683015]

A load balancing virtual server on a NetScaler appliance sends a reset code to the client when it receives the second packet of the client's POST request.

[From Build 71.24]

[# 683216]

A NetScaler appliance configured for NetScaler AAA with single sign-on is unable to log off from Online Web Access (OWA).

[From Build 71.24]

[# 688665]

A NetScaler appliance configured as a SAML Service Provider (SP) with redirect binding might intermittently change the user name during SAML authentication.

[From Build 71.24]

[# 690371]

A NetScaler appliance configured for NetScaler AAA becomes unresponsive during a VPN session if both of the following conditions are met:

• The primary session is in the timed out state.

• The secondary session is in sync but the actual state of the session is reset to zero.

[From Build 71.24]

[# 690468]

A traffic management virtual server using NetScaler AAA becomes unresponsive if both of the following conditions are met:

• The traffic management session requires multiple-factor logon.

• The session navigates to NetScaler Gateway before all of the factors are complete.

[From Build 71.24]

[# 690682]

Admin Partitions

Setting L2 and L3 parameters in Admin Partitions

On a partitioned NetScaler appliance, the scope of updating the L2 and L3 parameters is as follows:

- For L2 parameters that are set by using the "set L2Param" command, the following parameters can be updated only from the default partition, and their values are applicable to all the admin partitions: maxBridgeCollision, bdgSetting, garpOnVridIntf, garpReply, proxyArp, resetInterfaceOnHAfailover, and skip_proxying_bsd_traffic. The other L2 parameters can be updated in specific admin partitions, and their values are local to those partitions.

- For L3 parameters that are set by using the "set L3Param" command, all parameters can be updated in specific admin partitions, and their values are local to those partitions. Similarly, the values that are updated in the default partition are applicable only to the default partition.

[From Build 64.34]

[# 513564]

When creating an admin partition, you can now set the memory limit to a minimum value of 5 MB.

[From Build 64.34]

[# 580419]

Partition administrators cannot upload scriptable monitor scripts to a partition. This can only be done by NetScaler superusers. Also, scriptable monitors for an admin partition cannot be configured by using the GUI.

[From Build 64.34]

[# 583756]

In an admin partition, changes done to enable or disable a NetScaler feature or mode are not saved. Therefore, after the NetScaler appliance is rebooted, the status of the feature or mode is reset to its default value.

[From Build 64.34]

[# 594845]

In a partitioned NetScaler appliance, for GSLB services that point to a local load balancing virtual server, the monitors that are bound to that GSLB service fail. Also, connection proxy between local load balancing virtual servers does not work.

[From Build 66.11]

[# 613751]

If you remove an admin partition, the NetScaler appliance fails or corrupts an SNMPD packet queue.

[From Build 67.12]

[# 618251]

When the NSIP password is changed (by using the "set ns rpcnode" command) on the default partition, the GSLB auto-sync function does not work in the available admin partitions.

[From Build 65.35]

[# 621939]

When a user is authenticated, the persistence cookie is set, and any subsequent request that includes the cookie and matches the basic pattern is granted access to the server. However, in a non-default partition, if you specify a value for the ns_aaatm_tempc_allow_patterns default pattern set, the value is ignored.

[From Build 67.12]

[# 623404]

AppExpert

The order in which AppExpert evaluates application units cannot be changed. With this fix, the NetScaler GUI displays a burger icon for each application unit. After hovering over the icon, you can move an application unit up or down in the order of evaluation.

When a NetScaler appliance receives a client request for evaluating a responder policy, it might not log the responder data. Before evaluation, the appliance sets the ns_auditlog_module_id global variable and uses the data for log processing. If during the evaluation you block the log action and wait for more data, and while you are waiting the appliance receives another client request to evaluate a different policy, the responder log data is not recorded for the responder module.

[From Build 71.24]

[# 687140]

AppFlow

When routes are updated after an AppFlow collector is added, the NetScaler appliance sends ARP requests for the AppFlow collector IP address, even when the collector is reachable only through a router.

[From Build 63.16]

[# 574420]

The NetScaler appliance might become unresponsive if you enable the client side measurement option for an AppFlow action.

[From Build 64.34]

[# 595238]

The NetScaler appliance might become unresponsive if a request generated by a client is corrupted after execution of the client-side measurement script. This issue can occur if you enable the client side measurement option for an AppFlow action.

[From Build 64.34]

[# 601915, 601924, 607217]

A NetScaler load balanced server responds with a 411 error code for a corrupted HTTP request.

[From Build 70.16]

[# 629223]

When you try to save or check-in a document on the SharePoint server that has MDS enabled and AppFlow enabled on the NetScaler appliance, you will see the following error message: "An error occurred while processing the request on the server. The status code returned from the server was: 0".

[From Build 67.12]

[# 630611]

If non-http traffic is received on HTTP/SSL virtual servers, the NetScaler instance might become unresponsive.

[From Build 70.16]

[# 636639, 646280, 647656]

If you have configured NetScaler Gateway in a double-hop setup, HDX virtual desktops might become unresponsive when you perform the following sequence of actions: connect, disconnect and reconnect.

[From Build 68.10]

[# 641396]

If you have configured NetScaler Gateway in a double-hop setup, HDX virtual desktops might become unresponsive when you perform the following sequence of actions: connect, disconnect and reconnect.

[From Build 68.11]

[# 641396]

When AppFlow for ICA is enabled on a NetScaler appliance in a multi core environment, the Netscaler appliance might become unresponsive.

[From Build 68.10]

[# 647713]

When AppFlow for ICA is enabled on a NetScaler appliance in a multicore environment, the Netscaler appliance might become unresponsive.

[From Build 69.123]

[# 647713]

When AppFlow for ICA is enabled on a NetScaler appliance in a multi core environment, the Netscaler appliance might become unresponsive.

[From Build 68.11]

[# 647713]

Automatic client reconnection (ACR) for Linux VDA clients fails if the NetScaler appliance is in the path and ICA AppFlow is enabled for the appliance.

[From Build 69.123]

[# 648254, 651200]

Applications do not launch when AppFlow is enabled and connection chaining is disabled. This is because when a full sized packet is received, the connection chain ID is added to the packet resulting in the size of packet going beyond the maximum transmission unit (MTU). So, the packet gets dropped and the application fails to launch.

[From Build 69.123]

[# 650618, 653126, 661587, 664792]

Applications do not launch when AppFlow is enabled and connection chaining is disabled. This is because when a full sized packet is received, the connection chain ID is added to the packet resulting in the size of packet going beyond the maximum transmission unit (MTU). So, the packet gets dropped and the application fails to launch.

[From Build 68.11]

[# 650618, 653126, 657166, 661587]

If Appflow for ICA is enabled on a NetScaler appliance, the appliance might become unresponsive under certain circumstances during ICA capability negotiation in ICA PROXY mode.

[From Build 68.11]

[# 653385, 655823, 661720]

If Appflow for ICA is enabled on a NetScaler appliance, the appliance might become unresponsive under certain circumstances during ICA capability negotiation in ICA PROXY mode.

[From Build 69.123]

[# 653385, 655823, 661720]

The NetScaler appliance fails to work if the built-in NOPOLICY policy is configured as a global policy and AppFlow data is included in application firewall records sent to NetScaler Insight Center.

[From Build 69.123]

[# 656771]

If numerous GET requests are sent to a NetScaler appliance on which AppFlow is enabled, at some point the requests begin to time out.

[From Build 70.16]

[# 671993, 674438]

A NetScaler appliance crashes or becomes unresponsive when memory gets freed to wrong pools. The issue occurs if any of the following set of features are enabled on the appliance:

Application Firewall

The exported, learned data for field formats does not match the output of the following command: sh appfw learning data.

[From Build 68.10]

[# 329025, 303481]

The exported, learned data for field formats does not match the output of the following command: sh appfw learning data.

[From Build 68.11]

[# 329025, 303481]

The exported, learned data for field formats does not match the output of the following command: sh appfw learning data.

[From Build 67.12]

[# 329025, 303481]

If you use the default browser PDF plugin to view an application firewall report, embedded links might be inactive.

[From Build 63.16]

[# 372768]

The Skip operation for the application firewall learned rules might take longer than expected.

[From Build 63.16]

[# 547978]

When a user-defined application firewall signature object is updated by using the configuration utility, the enabled rules might get disabled and the configured actions in some signature rules might not be preserved.

[From Build 64.34]

[# 561567]

When the application firewall signature has upper case or mixed case characters in the name, the configured profile bindings for such a signature are not displayed in the signatures pane in the configuration utility.

[From Build 66.11]

[# 561845, 620915]

If, when processing a form for response-side security check inspection, the application firewall resets a connection, the partially parsed form is not freed. The result is a memory leak. With this fix, the memory allocated to the partially parsed forms is freed when a connection is reset.

[From Build 62.10]

[# 572637, 581520]

The NetScaler application firewall terminates the connection when the request comes with a tampered session cookie and the cookie protection is enabled.

[From Build 64.34]

[# 574498, 591172]

The NetScaler application firewall terminates the connection when the request comes with a tampered session cookie and the cookie protection is enabled.

[From Build 63.16]

[# 574498, 591172]

The Citrix application firewall silently resets the connection when it receives a malformed or invalid request. With this fix, the application firewall logs such events.

[From Build 63.16]

[# 577742]

During an application firewall security check inspection, a compressed response from the server might trigger a violation if the XML format check is enabled. With this fix, the Accept-Encoding request header is removed when the XML protections are enabled. If content compression is enabled on the server, the XML check inspection is bypassed when the server sends a compressed response.

[From Build 63.16]

[# 580273]

After processing a request that consists of multiple headers of the same type, a subsequent request might invoke a 302 response due to the way the application firewall stores the information about the parsed headers. With this fix, the variable that stores the information regarding the headers is reinitialized accurately before the next request is processed.

[From Build 63.16]

[# 580564]

After processing a request that consists of multiple headers of the same type, a subsequent request might invoke a 302 response due to the way the application firewall stores the information regarding the parsed headers. With this fix, the variable which stores the information regarding the headers is reinitialized accurately prior to processing the next request.

[From Build 62.10]

[# 580564]

If learning thresholds for the application firewall security checks are set to a value greater than 1, the configuration utility displays the following error message when you try to access the learned data: "communication error with aslearn."

[From Build 63.16]

[# 584621]

Signatures version may not get updated correctly if updated_signatures.xml file is present in /nsconfig folder. With this fix, this file is removed during build installation and the version of the application firewall signatures is updated accurately.

[From Build 64.34]

[# 588640]

The application firewall has extended external format signature support for a new scan tool called WebInspect. The WebInspect scan tool, provided by Hewlett Packard (HP), is designed to analyze the web applications and web services for security vulnerabilities. As stated in the following Data Sheet link from HP, "WebInspect provides the broadest dynamic application security testing coverage and detects new types of vulnerabilities that often go undetected by black-box security testing technologies": http://www8.hp.com/h20195/V2/GetPDF.aspx/4AA1-5363ENW.pdf.

See http://docs.citrix.com/en-us/netscaler/11/security/application-firewall/signatures.html" for the details of importing and configuring signatures.

[From Build 64.34]

[# 588914, 609060]

NetScaler application firewall resets the connection when the request contains tampered session cookie and the cookie protection is enabled.

[From Build 64.34]

[# 591172, 574498]

NetScaler application firewall resets the connection when the request contains tampered session cookie and the cookie protection is enabled.

[From Build 63.16]

[# 591172, 574498]

The NetScaler appliance might fail when the application firewall is processing the cookie header(s) in an HTTP request. This occurs when the cookie transform action is enabled and all other security checks that apply to establishing a user session are disabled.

[From Build 63.16]

[# 591176, 593996, 597440, 601359]

The NetScaler appliance might fail when the application firewall is processing the cookie header(s) in an HTTP request. This occurs when the cookie transform action is enabled and all other security checks that apply to establishing a user session are disabled.

[From Build 64.34]

[# 591176, 593996, 597440, 601359]

The NetScaler appliance might fail when the application firewall receives an HTTP response with an attribute value that exceeds 1 MB in length.

[From Build 64.34]

[# 592018]

The NetScaler appliance might become unresponsive when processing a request, because of an interoperability issue between the application firewall, SSL, and the responder module. The issue arises under the following set of circumstances:

The configuration includes an application firewall profile protecting an SSL virtual server.

A responder policy is configured to reset the connection, and this policy is bound either globally or to the virtual server that receives the request.

[From Build 63.16]

[# 592429]

The NetScaler appliance might become unresponsive when processing a request, because of an interoperability issue between the application firewall, SSL, and the responder module. The issue arises under the following set of circumstances:

The configuration includes an application firewall profile protecting an SSL virtual server. A responder policy is configured to reset the connection, and this policy is bound either globally or to the virtual server that receives the request.

[From Build 64.34]

[# 592429, 612052]

When URLTransform or CVPN policies are configured, application firewall code is invoked to carry out the validation of http packet information even if application firewall feature is disabled. When streaming code is engaged, the application firewall is not processing the conditional headers accurately and might reset connection and respond with RST code 9856. With this fix, parsing and validating the request headers is handled correctly by the application firewall module.

[From Build 64.34]

[# 593960, 605920]

The application firewall buffers the entire request for security check inspections. Therefore, when the client sends the expect 100-continue header in the request, the application firewall sends the 100-continue response to get the entire request from the client. The application firewall modifies the expect 100-continue header received from the client and corrupts it before forwarding the processed request to the server. In the 11.0 release, the header was not corrupted before it was forwarded request to server. With this fix, the expect 100-continue header from the client is modified and a corrupted header is sent to the server.

[From Build 64.34]

[# 598607]

The application firewall might experience a transient low-memory condition during a traffic surge if advanced security check protections (such as Form Field consistency, CSRF, form tagging and so on, which require rewriting the HTML forms in the response) are enabled for the profiles. This might result in a memory leak, and memory allocation failures might occur even after the traffic surge subsides.

[From Build 65.35]

[# 598776, 597952]

When the application firewall redirects a blocked request to a customized error page, the ${NS_APPFW_SESSION_ID};variable on the error page might not display the session ID accurately. If the request does not contain a session cookie, the variable might display a hyphen (-) instead of the session ID.

[From Build 64.34]

[# 599052]

Application firewall profiles that are exported and archived from one build cannot be restored to a system running a different build, because changes introduced in the newer releases can lead to compatibility issues. With this fix, the application firewall now logs an error message, in ns.log, if you attempt to restore an archived profile to a different build than the one from which it was exported.

[From Build 64.34]

[# 601064]

When you use the NetScaler GUI to perform the Skip operation, the application firewall learned rules might not be deleted. This occurs because NITRO is sending wrong "Location" ("Field") data to the GUI. With this fix, the GUI converts "Field" into "FORMFIELD," and the Skip operation removes the skipped rules, as expected.

[From Build 65.35]

[# 603473]

If the application firewall cookie proxy check is enabled and the server tries to expire and modify the same cookie in the same response, the NetScaler appliance might fail because of memory corruption.

[From Build 64.34]

[# 603694, 609394]

NetScaler application firewall handles memory incorrectly if XSS and "CrossSiteScriptingCheckCompleteURLs" are enabled in the application firewall profile. The errors also appear if "checkrequestHeaders" and finegrained relaxations are enabled.

[From Build 65.35]

[# 606931]

In a cluster deployment, accessing the application firewall learned data might display "Error in retrieving Application Firewall learning data. Communication error with aslearn". This error is triggered if buffer overflow occurs when the cluster configuration coordinator tries to get learned data from the other nodes of the cluster.

[From Build 64.34]

[# 607187]

The application firewall allows configuring default field format parameters. The valid range for the maximum field format length is 1-65535. The GUI as well as CLI currently accepts zero as input even though zero is outside the allowed range.

[From Build 67.12]

[# 608010, 603763, 629859]

When the application firewall cookie proxy check is enabled, the NetScaler appliance might become unresponsive while updating the cookies in the distributed hash table with a set of cookies from the server.

[From Build 65.35]

[# 609394, 618385]

When you use the NetScaler GUI to perform the Skip operation, the application firewall learned rules might not be deleted. This occurs because NITRO is sending wrong "Location" ("Field") data to the GUI. With this fix, the GUI converts "Field" into "FORMFIELD," and the Skip operation removes the skipped rules, as expected.

[From Build 65.35]

[# 610116, 603473]

In NetScaler web application firewall high availability deployments, application firewall sessions are not cleaned up on the secondary node. As a result, memory usage increases on the secondary node.

[From Build 65.35]

[# 612284, 619056]

In release 10.5.e (enhancement builds only) as well as in the 11.0 release builds, application firewall processing of the Cookie header was changed. In those releases, every cookie is evaluated individually, and if the length of any one cookie received in the Cookie header exceeds the configured BufferOverflowMaxCookieLength, the Buffer Overflow violation is triggered. As a result of this change, requests that were blocked in 10.5 and earlier release builds might be allowed, because the length of the entire cookie header is not calculated for determining the cookie length. In some situations, the total cookie size forwarded to the server might be larger than the accepted value, and the server might respond with "400 Bad Request".

With this fix, the change has been reverted. The behavior is now similar to that of the non-enhancement builds of release 10.5. The entire raw Cookie header is now considered when calculating the length of the cookie. Surrounding spaces and the semicolon (;) characters separating the name-value pairs are also included in determining the cookie length.

[From Build 65.35]

[# 614449]

You might encounter unexpected failures if form field consistency protection is enabled on the application firewall profile and you try to retrieve the form from Distributed Hash Table (DHT).

[From Build 65.35]

[# 616191]

In certain cases, if a custom error page containing variables is served to the client, the content length in the response is incorrect. As a result, the custom error page might not be visible in the client's browser.

[From Build 65.35]

[# 616947]

The secondary node in an HA deployment attempts to directly connect to AWS for signature auto updates. Instead, it should sync from the primary node.

[From Build 66.11]

[# 617314, 628030]

The application firewall's SQL Injection special-character transform does not work properly if either of the following parameters is enabled in a profile:

-crossSiteScriptingTransformUnsafeHTML

-SQLInjectionTransformSpecialChars

[From Build 66.11]

[# 617614, 624646, 624653]

In a cluster deployment, the NetScaler web application firewall (WAF) fails if starturl closure is enabled.

[From Build 66.11]

[# 617680]

The XSS transform for special characters in the application firewall might not work as expected if the -crossSiteScriptingTransformUnsafeHTML option or the sqlTransformAction option is set to ON in the profile.

[From Build 65.35]

[# 618707]

After an upgrade from release 10.5 to a release 11.0 build, uploading a Word document triggers false positives for application firewall SQL and XSS violations during the file upload operation. With this fix, the behavior is the same as in 10.5. The application firewall inspects text, Javascript , HTML, XML and JSON contents when a file is uploaded. It doesn't inspect any other contents.

[From Build 66.11]

[# 619354]

If you use the Mozilla Firefox browser to access the NetScaler GUI, you cannot make changes to the application firewall configuration.

[From Build 65.35]

[# 619978]

In a high availability (HA) deployment, a memory leak can occur if auto-update of application firewall signatures is enabled or you update the signatures by using the Merge Default (-mergedefault) option.

[From Build 68.11]

[# 620878, 629043, 641457, 649075]

In a high availability (HA) deployment, a memory leak can occur if auto-update of application firewall signatures is enabled or you update the signatures by using the -mergedefault option.

[From Build 67.12]

[# 620878, 629043, 641457]

In a high availability (HA) deployment, a memory leak can occur if auto-update of application firewall signatures is enabled or you update the signatures by using the Merge Default (-mergedefault) option.

[From Build 68.10]

[# 620878, 629043, 641457, 649075]

When editing application firewall signatures, you cannot sort on the "Enabled" column.

[From Build 71.24]

[# 621333]

Application Firewall memory allocation errors might occur if the license on the NetScaler appliance restricts the number of packet engines.

[From Build 65.35]

[# 621798]

On a partitioned NetScaler appliance, connections for incoming requests might be reset if the application firewall feature is enabled.

[From Build 66.11]

[# 622826]

In a cluster setup, while exporting application firewall learnt data, you might see the following error message:

"communication error with aslearn"

This message is because of a schema difference.

[From Build 65.35]

[# 625807]

The NetScaler appliance fails if you enable or disable the IP Reputation feature in any partition other than the default partition.

[From Build 66.11]

[# 627505, 628073]

If a client submits a form that includes a field named "as_fid", and the application-firewall profile has signatures enabled, the signatures might block form submissions from that client.

[From Build 66.11]

[# 628525]

Starturl relaxations might not work if regex expressions use grouping for matching multiple terms. The URL might not get matched against all the terms in the group.

[From Build 66.11]

[# 628789]

If referer header protection is enabled on the application firewall and the starturl action specified is either "stats" or "learn," webpages might not load correctly.

[From Build 66.11]

[# 629385, 638602]

The NetScaler appliance might fail when application firewall is attempting to log messages regarding the user's session but the source string is NULL due to memory corruption.

[From Build 67.12]

[# 635738]

A NetScaler appliance in a high availability configuration might fail when the Application Firewall HTTP request is chunked or the chunk-header information is split across the packet and the content-type is "application/x-www-form-urlencoded" and "multipart/form-data".

A NetScaler Application Firewall appliance in a high availability configuration might run out of memory, because firewall sessions might not get cleaned up if sync or propagation is disabled or the software versions running on a pair of nodes do not match. This is due to DHT not being able to clean up session entries properly.

[From Build 69.123]

[# 646293, 645547, 658502]

On a NetScaler appliance in a high availability configuration, a cookie header length of 61 or greater triggers Buffer Overflow violations and causes Application Firewall related scripts to fail.

[From Build 69.123]

[# 646775, 648952]

Sites that use the NetScaler application firewall have excessive high availability failovers because of a faulty error-handling routine related to memory allocation.

[From Build 67.12]

[# 647309]

The name of a user defined signature object must not contain a hash-mark character (#), but the feedback message lists it as an allowed character.

[From Build 68.10]

[# 648010]

The name of a user defined signature object must not contain a hash-mark character (#), but the feedback message lists it as an allowed character.

[From Build 68.11]

[# 648010]

If the HTML response page contains a pair of hyphens (--) in the comment tag, the NetScaler appliance might parse the response page incorrectly. This could result in a violation.

[From Build 68.11]

[# 648104]

If the HTML response page contains a pair of hyphens (--) in the comment tag, the NetScaler appliance might parse the response page incorrectly. This could result in a violation.

[From Build 68.10]

[# 648104]

Applications might not load properly when the memory_max_allowed value for the AppFW pool is low. This low memory condition can also cause memory allocation errors that result in numerous connection resets.

[From Build 68.10]

[# 649031, 651536]

Applications might not load properly when the memory_max_allowed value for the AppFW pool is low. This low memory condition can also cause memory allocation errors that result in numerous connection resets.

[From Build 68.11]

[# 649031, 651536]

On a NetScaler appliance running release 11.1 build 64, SQL and cross-site scripting relaxations might not work for application or json content types. The AppFW logs display the following message, even when the relaxation rules are applied for User-Agent:

SQL Keyword check failed for header User-Agent.

[From Build 71.24]

[# 651054]

Enhancement: Application Firewall Log Messages

NetScaler Application Firewall can now generate log messages when it triggers a page redirect because of being unable to parse the content-type header format properly.

- The appliance is configured to log for parsing errors in XML responses, and the configuration includes a confidential field. Webform fields can be designated as confidential fields to protect the information that users type into them.

- The appliance receives a request in which query parameters are set.

- A parsing error occurs during processing of the XML response.

[From Build 69.123]

[# 658561, 639647]

NetScaler release 11.0 build 47 or later logs error messages when you enable the application firewall feature on a NetScaler appliance in high availability mode.

[From Build 69.123]

[# 660528]

NetScaler release 11.0 build 47 or later logs error messages when you enable the Application Firewall feature on a NetScaler appliance in high availability mode.

[From Build 70.16]

[# 660528]

In a high availability setup, after successful deployment of the Application Firewall learned StartURL rule from the GUI, the rule remains in the learned database and is not removed. Deploying the same startURL rule results in the following error message: "The StartURL check is already in use."

[From Build 69.123]

[# 661111]

If you upgrade NetScaler appliance in a high availability (HA) setup from version 10.5.56.15 to version 11.1.51.1901 and skip 250 rules with active traffic, the GUI or CLI displays a "failed to skip some rules" error message and an operation time-out error message.

[From Build 70.16]

[# 661111, 662359, 670726, 662734]

On a NetScaler Application Firewall appliance in a high availability configuration, learning mode does not work after an upgrade to release 11.0 build 68.10.

[From Build 69.123]

[# 662359]

On a NetScaler Application Firewall appliance in a high availability configuration, learning mode does not work after an upgrade to release 11.0 build 68.10.

[From Build 70.16]

[# 662359]

On a NetScaler Application Firewall appliance in a high availability configuration, learning mode does not work after an upgrade to release 11.0 build 68.10.

[From Build 69.123]

[# 662734]

On a NetScaler Application Firewall appliance in a high availability configuration, learning mode does not work after an upgrade to release 11.0 build 68.10.

[From Build 70.16]

[# 662734]

A log message is not generated when the FormFieldConsistency protection is enabled on an Application Firewall profile and the generated hidden field "as_fid" is modified.

With this fix, the NetScaler Application Firewall now generates a log message when the "FormFieldConsistency" protection is enabled and the hidden field "as_fid" is modified in the NetScaler Application Firewall profile.

[From Build 69.123]

[# 664211]

A NetScaler appliance might fail when Application Firewall processes a request for SQL injection inspection, if the request has the SQLInjectiontype field set to "SQL Special Char or Keyword" and SQL comment handling is set to "ANSI/Nested".

[From Build 69.123]

[# 665631, 669524]

The NetScaler appliance crashes during a field-consistency check if processing a large number of form-select fields.

[From Build 70.16]

[# 668627, 664482]

Application firewall signature rule #14990 has a PCRE expression pattern to detect the presence of a violation string in the Accept-Charset header. This expression is computationally intensive and results in generation of log message "PCRE match limit exceeded with regex..." With this fix, rule #14990 is deprecated and replaced by signature rule #999972, which has an optimized PCRE expression. The new rule shows the source as Snort and the Snort ID as 14990.

[From Build 70.16]

[# 669824]

An archive error can occur when application firewall profiles are exported and archived, because the export file is not removed from the /var/archive/appfw/ and /var/tmp directories after profile export is successful. The problem is caused by an uppercase profile name when the archived export file is saved with the same case as the profile name.

[From Build 70.16]

[# 670744]

During the downgrade process, the NetScaler appliance becomes unresponsive and generates an aslearn core file if the application firewall schema profile of the learned database files is not installed properly.

[From Build 70.16]

[# 670752]

A large number of DHT operations causes high CPU usage when StartURLClosure is enabled.

[From Build 71.24]

[# 672807, 672753, 686596, 695505, 694020]

When a user-defined application firewall signature object is updated by using the configuration utility, the enabled signature rules might get disabled and the configured actions in some signature rules might not be preserved.

[From Build 70.16]

[# 674031]

The NetScaler appliance fails to restart after an upgrade to software release 11.1 build 51.21. The failure, caused by memory corruption in the AppSecure module, occurs while evaluating an invalid session cookie.

[From Build 70.16]

[# 674361]

Form based NetScaler AppFirewall checks can be bypassed by a multipart POST request in which the Content-type header has been tampered with.

[From Build 71.24]

[# 674658]

The IP reputation feature does not get enabled when the application firewall add-on license is added.

[From Build 70.16]

[# 675202]

A NetScaler appliance running release 11.1 fails to restart after a failover if Distributed Hash Table (DHT) entries are not in sync across the HA nodes.

[From Build 71.24]

[# 678072]

Since release 11.1 build 41, the ImportSizeLimit parameter in the AppFW settings can be set to limit the size of the objects that are imported to the NetScaler appliance. This limit is now extended from 128 MB to 256 MB. Execute the following set command from the CLI to change the value to meet your requirement:

set appfw setting -importsizelimit

Maximum value: 268435456

Minimum value: 1

Default: 134217728

Example

> set appfw setting -importsizelimit 268435457

[From Build 71.24]

[# 682219]

Application firewall log messages generated when data is dropped because of Unknown Content-Type do not include the Content-Type Header value, which would facilitate tracking and monitoring.

This issue has been fixed now. The application firewall logs allows requests which have multiple charsets with same value in the content-type header.

[From Build 71.24]

[# 682778]

On a NetScaler AppFirewall appliance, URL global pages cause memory buildup on the secondary node when the URL closure protection feature is enabled.

[From Build 71.24]

[# 683366]

When you attempt to export learned data for an application firewall profile, the appliance fails because of improper initialization of a stack variable. The Aslearn process restarts continuously because of connection failure.

[From Build 71.24]

[# 684988]

If you use the CLI of a NetScaler AppFirewall appliance to display an enum definition, the AS_CCARD_DEFAULT_CARD_TYPE default value for credit card options is not included.

[From Build 71.24]

[# 686540]

The NetScaler packet processing engine fails to start when URL transform regression scripts are executed during a low-memory condition.

[From Build 71.24]

[# 687625]

The NetScaler appliance crashes when security insight is enabled and the application firewall detects a violation of the maximum limit for fld_name length.

Set the fld_name length limit to the same value as MAX_AS_NAME_LEN.

[From Build 71.24]

[# 690028, 690556, 690467, 692023]

After an upgrade from an earlier release 11.0 build to release 11.1 build 55.4, the 'APPFW_RESET' and 'APPFW_DROP' AppFw profiles do not appear when you run the sh appfw profile command with the "more" option.

For example:

sh appfw profile | more

1) Name: APPFW_BYPASS LogEveryPolicyHit: OFF

2) Name: APPFW_RESET LogEveryPolicyHit: ON

3) Name: APPFW_DROP LogEveryPolicyHit: ON

4) Name: APPFW_BLOCK UseHTMLErrorObject: OFF

This issue does not occur after upgrading a NetScaler AppFirewall appliance to release 11.1 build 55.8.

[From Build 71.24]

[# 690261, 689327]

On a NetScaler application firewall appliance in high-availability mode, using the "aslearn -stop" command to stop the aslearn process causes a core dump but does not stop the aslearn process.

[From Build 71.24]

[# 692060]

On a NetScaler application firewall appliance in a high-availability mode, the DUT might crash when performing application security check because of memory resource constraints for the NetScaler appliance.

[From Build 71.24]

[# 694195]

Audit logging

You can now customize the log levels for logs generated for AAATM user logon or logoff, and for logs generated for executive commands by a NetScaler administrative user.

[From Build 65.35]

[# 386650]

Cache

A NetScaler VPX instance becomes unresponsive if a range request is greater than the cached response size. This issue happens if you enable the media classification mode on a NetScaler appliance. While parsing range header and creating range records table, the value for parameter object size is set incorrectly. So when a range request is received, the incorrect value of the stored response causes failure.

[From Build 69.123]

[# 657823, 659374, 661940, 662460, 667599]

Cache Redirection

If a request to a cache redirection virtual server resolves to an IP address that belongs to a content switching virtual server configured on the NetScaler appliance, the appliance might fail.

[From Build 65.35]

[# 621522]

In the GUI, the Policy drop-down list does not display the cache redirection policies.

[From Build 65.35]

[# 622402]

Classic cache redirection policies send CONNECT requests to the cache, as expected, if they do not match the policy rule, but default syntax cache redirection policies send them to the origin server instead. With this fix, default syntax cache redirection policies send nonmatching requests to the cache.

[From Build 68.10]

[# 637826]

Classic cache redirection policies send CONNECT requests to the cache, as expected, if they do not match the policy rule, but default syntax cache redirection policies send them to the origin server instead. With this fix, default syntax cache redirection policies send nonmatching requests to the cache.

[From Build 68.11]

[# 637826]

Counters for classic cache redirection policies are not incremented for HTTPS traffic.

[From Build 71.24]

[# 657190]

Cisco RISE Integration

If RISE feature is not enabled and we try to disable it, an error message is displayed for all the features.

[From Build 65.35]

[# 513761]

Cluster

A NetScaler cluster does not respond to cURL HTTP requests from outside the datacenter, because the Path MTU Discovery (PMTUD) mode gets disabled when a cluster is created.

[From Build 64.34]

[# 541223]

In a cluster setup, a command that is executed on the cluster configuration coordinator is propagated to the other cluster nodes. Therefore, a command that takes a long time to complete (such as "save ns config"), can take a little extra time to complete on all the cluster nodes. During this time, if you execute another command on the cluster (through another session), that command will fail because the previous command is not yet complete.

[From Build 63.16]

[# 551607, 495270, 562651]

In a cluster setup, for active FTP, the server cannot initiate a data connection from a random port.

[From Build 62.10]

[# 559230, 571042]

In a NetScaler cluster, a "sh nslogaction" command that is issued from the NSIP address of a cluster node, goes into an infinite loop. The issue is not observed when the command is issued from the cluster IP address.

[From Build 62.10]

[# 574333, 573645]

You cannot add LB routes in a link load balancing setup that is deployed on a cluster.

[From Build 62.10]

[# 574717]

When WIonNS is deployed in a cluster setup, if you add a service that points to the NSIP of a newly joined node, the command fails on the newly joined node but succeeds on the other cluster nodes.

[From Build 64.34]

[# 584699]

For some commands, such as "add cs policy" and "add server," the ID generated on a non-CCO node already exists for another command of same type on the cluster configuration coordinator (CCO). Therefore, command execution on the non-CCO node fails.

[From Build 66.11]

[# 614718, 615459]

The VRRP Feature does not work in a cluster setup that includes a node with a node ID of zero (0).

If a load balancing server is trying to synchronize its states, occasionally one or more cluster nodes might get stuck in a Service state. As a result, the other nodes in the cluster might be unavailable, which leads to an improper cluster formation.

[From Build 69.123]

[# 651828]

The Node-to-Node Messaging (NNM) framework for clustering wastes CPU time in the packet engine (PE) loop. With this fix, the appliance implements an yielding logic in the PE loop to reduce the NNM invocation frequency.

[From Build 70.16]

[# 671347]

Command Line Interface

The NetScaler CLI exhibits the following issues on running the "show" and "stat" commands on a service group.

- When using the "show servicegroup -includeMembers" command: This command lists only one service per service group, although more than 1 service are bound to the service group(s).

- When using the "stat servicegroupMember <ServiceGroupName> <Service-IP-address> <port>" command: This command does not work if you specify the <Service-IP-address>. Instead, you must specify the <Service-Name>.

[From Build 66.11]

[# 554652, 596571]

A customized CLI prompt is not persisted after rebooting the appliance.

[From Build 63.16]

[# 583625]

Configuration Utility

You cannot install a server, client, or intermediate certificate with a FIPS key by using the configuration utility.

[From Build 65.35]

[# 485942]

If you click a VLAN in the network visualizer, details such as VLAN ID and bound interfaces are not displayed in a separate pane.

[From Build 64.34]

[# 540943]

The operation to download the nstrace file from the configuration utility fails.

[From Build 62.10]

[# 571814, 581955]

The operation to download the nstrace file from the configuration utility fails.

[From Build 63.16]

[# 571814, 581955]

You cannot configure the service path AVP by using the configuration utility.

[From Build 63.16]

[# 576603]

You cannot configure the service path AVP by using the configuration utility.

[From Build 62.10]

[# 576603]

The values for the parameters on the "Configure Load Balancing Parameters" page do not appear even though they have been set.

[From Build 63.16]

[# 583741]

SUBSCRIBER expressions do not appear in the list for rewrite and responder policies and action.

[From Build 63.16]

[# 583751]

When an HTML page is imported, the content is copied to /nsconfig/ssl and then to /var/download/responder. The content is not removed from /nsconfig/ssl, although it serves no purpose there. With this fix, the content is copied directly to to /var/download/responder.

[From Build 64.34]

[# 590268]

You cannot add user-defined values for the user name and group name fields on the Authentication CERT Profile page.

With this fix, you can specify a user-defined value by navigating to Security > AAA - Application Traffic > Policies > Authentication > Basic Policies > CERT > Profiles or NetScaler Gateway > Policies > Authentication > CERT > Profiles and selecting New in the User Name Field list and the Group Name Field list.

[From Build 64.34]

[# 597708]

The integrated caching feature is not available on the GUI.

[From Build 64.34]

[# 601429]

When starting a nstrace and another instance is already running, an option to stop this is not available in the configuration utility. One has to login through the command line interface to stop the trace.

[From Build 64.34]

[# 603476]

If you create a cipher group and do not add any ciphers to it, an error message appears when you try to open the cipher group in the configuration utility.

[From Build 64.34]

[# 604646]

The configuration utility does not reflect the correct count of cached objects whereas this number is shown correctly through the command line interface.

[From Build 64.34]

[# 607622, 608517]

If you are using the configuration utility to run diagnostics on the NetScaler appliance, you cannot specify a traffic domain.

[From Build 64.34]

[# 609334]

If you log on to the appliance by using the GUI, the list of licenses is not retrieved.

[From Build 65.35]

[# 611772]

Content Switching

In certain cases, if the state of a load balancing virtual server changes, the NetScaler appliance might fail while changing the state of the associated content switching virtual server.

[From Build 65.35]

[# 522510, 528782, 538223, 552913, 602829]

If a large number of content switching policies are bound to a content switching virtual server, using the configuration utility to bind a new policy without explicitly assigning a priority might result in the policy being assigned the priority of the first policy on the next page of the display. Since a policy is already assigned that priority, an error message stating that the priority is already used appears.

[From Build 64.34]

[# 601203]

The NetScaler appliance might fail if you change the target of a content switching policy action from virtual server based to expression based.

[From Build 69.123]

[# 657325, 653722, 659696, 661214]

DNS

Non-standard query packets are altered before they are forwarded to back-end servers, which causes the server to respond with a "FORMAT error" message.

[From Build 66.11]

[# 559064]

The query logs contain incorrect information if the UDP payload size in the OPT record is not 1280. Also, if a load balancing virtual server on the NetScaler appliance receives a request with the CD bit set, and the "RecusionAvailable" parameter is disabled on the DNS or DNS-TCP load balancing virtual server, the CD bit is not logged.

[From Build 63.16]

[# 579942]

If, while a DNS-TCP client request is in surge queue, the NetScaler appliance receives a FIN from the client and responds with a FIN or ACK before the queued request is forwarded to the backend server, the appliance might fail.

[From Build 64.34]

[# 581723]

If a NetScaler appliance in DNS resolver mode is configured to resolve queries with suffixes, the appliance fails if there is no address record for the NS record associated with one of the suffixes.

[From Build 65.35]

[# 605861]

The NetScaler appliance fails, if there is a cache miss when the backend DNS server is accessed directly through the NetScaler appliance.

[From Build 64.34]

[# 609074]

If, while resolving a domain name in DNS resolver mode, the NetScaler appliance does not receive a response from the first name server, it tries to resolve the domain name with the other name servers. During this process, if the address record for the associated NS record is not present, the NetScaler appliance fails.

[From Build 65.35]

[# 609967, 617204]

Due to a memory overwrite issue, the prev value of dns_tot_ServerQueries counter is set to zero everytime during the end of perf collection cycle, that is every 7 seconds. This results in the difference between cur and prev value get accumulated to the global counterpart even if there is no traffic.

[From Build 65.35]

[# 615519, 580342]

In a deployment with heavy DNS traffic and many DNS cache entries, some entries in the cache might not get updated or deleted, even after the TTL expires.

[From Build 67.12]

[# 619124, 622308]

A NetScaler appliance configured as an DNS end resolver sometimes fails to respond to DNS queries. When the appliance is configured as an end resolver, it generates iterative DNS queries to name servers on behalf of the client and returns the final responses. If a DNS zone has multiple NS records, the appliance queries the first name server in the NS record. If this resolution fails, the appliance does not retry with other name servers in the NS records, and it does not send any response to the client.

[From Build 69.123]

[# 645836]

A clear config operation in a Cluster deployment does not set non-CCO nodes to the default value for the "max pipeline" parameter.

[From Build 68.10]

[# 648087]

A clear config operation in a Cluster deployment does not set non-CCO nodes to the default value for the "max pipeline" parameter.

[From Build 68.11]

[# 648087]

If the DNS server from which the cached DNS records are being served goes DOWN, the proactive DNS update queries are redirected to the back-end server.

[From Build 70.16]

[# 660562]

The set lb vserver command allows you to assign the same IP address to the DNS name server and the DNS virtual server. With this fix, neither the set lb vserver nor the add dns nameServer command, nor the NetScaler GUI, allows you to assign the same address to both virtual servers.

[From Build 70.16]

[# 665651]

When the NetScaler appliance receives a DNS TCP packet that has dnspayloadlen as zero, the appliance might dump core memory.

[From Build 70.16]

[# 666803]

If the load balancing feature is disabled and DNS name servers are being used, DNS resolution uses the most recently configured name server. If that name server is disabled, one of the name servers that is UP is used for DNS resolution.

[From Build 70.16]

[# 670588]

When a NetScaler appliance on which DNSSEC is configured is an authoritative DNS server for two domain zones, the appliance might send the same RRSIG responses to both zones instead of responding to only the appropriate zone.

[From Build 70.16]

[# 671880]

In ADNS and resolver mode, the NetScaler appliance does not support the OPT option. Therefore, it strips this option when responding to a client. In proxy mode, the query is forwarded as-is to the back end. If the response contains the EDNS Client Subnet (ECS) option, the response is forwarded to the client as-is, but not cached. If the back end does not support ECS option and therefore strips this option from the response, the response is cached as well as forwarded.

[From Build 70.16]

[# 672905]

When a NetScaler appliance in resolver mode receives a DNS response from a name server and forwards it to an alternative name server, the NetScaler appliance goes DOWN.

[From Build 71.24]

[# 682730, 683138, 680141]

DataStream

A NetScaler client becomes unresponsive if:

1. The NetScaler appliance receives the complete response to the client's query from the server.

2. At the same time, the client sends an attention packet to the appliance.

The client becomes unresponsive because the appliance closes the server-side connection but does not send the client a response to the attention packet.

[From Build 65.35]

[# 560401]

If the NetScaler appliance receives a prelogin message request from a Visual Studio 2015 client, it sends an incorrect response. As a result, the client becomes unresponsive.

[From Build 66.11]

[# 613239, 616404]

The DataStream feature does not work if you use a MySQL database at the back end.

[From Build 69.123]

[# 629504]

Domain Name System

If you have configured a large number of HTTP profiles, occasionally the NetScaler appliance might dump core and restart.

[From Build 69.123]

[# 662929]

GSLB

GSLB Service Selection using Content Switching

Description: You can now configure a content switching (CS) policy to customize a GSLB deployment so that you can:

* Restrict the selection of a GSLB service to a subset of GSLB services bound to a GSLB virtual server for the given domain.

* Apply different Load Balancing methods on the different subsets of GSLB services in the deployment.

* Apply spillover policies on a subset of GSLB services, and you can have a backup for a subset of GSLB services.

* Configure a subset of GSLB services to serve a specific type of content.

* Define a subset GSLB services with different priorities, and define the order in which the services in the subset are applied to a request.

For more information, see Configuring GSLB Service Selection Using Content Switching.

If you have configured the canonical name as the GSLB domain in NetScaler appliance, when the backend server returns the CNAME record without the requested record, NetScaler appliance changes the TTL value of the GSLB domain with the TTL value of the CNAME record.

[From Build 63.16]

[# 582925]

If a server entity (for example, a server IP address or server name) is associated with both a GSLB entity and a non-GSLB entity on a GSLB site, and the GSLB configuration is synced to another site that does not include this server entity, the synchronization removes the server entity and all other entities associated with that server.

[From Build 64.34]

[# 590336]

In a GSLB deployment, if monitors are bound to GSLB services and the trigger monitor is set to MEP_DOWN. The remote GSLB services are incorrectly marked as down when MEP goes down due to temporary network outage but the MEP connection is still active.

[From Build 66.11]

[# 610065]

In a content switching GSLB deployment, you can bind multiple domains to a CS GSLB virtual server, but the show cs vserver command shows only one domain bound to the CS GSLB virtual server.

[From Build 65.35]

[# 612916]

When the MEP connection between two GSLB sites is reestablished after going down, the connection becomes active immediately, but the NetScaler GUI and CLI do not show it as UP for about 9 seconds.

[From Build 66.11]

[# 615886]

In a GSLB setup, if you have configured static proximity as the primary load balancing method and RTT as the backup load balancing method, the NetScaler appliance might intermittently send an empty response to a DNS query requesting the GSLB domain.

[From Build 69.123]

[# 616321]

In the GUI, on the GSLB statistics page, the local site MEP state is always displayed as DOWN instead of as a blank field.

[From Build 65.35]

[# 617267]

The NetScaler appliance fails if you run the "show gslb domain" command on a non-gslb domain record.

[From Build 65.35]

[# 618789]

When using the GUI in a partitioned environment, you cannot add GSLB services.

[From Build 65.35]

[# 622131]

For GSLB deployments in a partitioned environment, the options to synchronize the GSLB configuration and view the synchronization status are provided in the GUI.

[From Build 65.35]

[# 622147]

After being upgraded to NetScaler release 11.0, the appliance cannot access the geoIP location database.

[From Build 67.12]

[# 639371]

If the GSLB virtual server is of type RADIUS and if the rewrite or responder feature is disabled, the NetScaler appliance fails when it gets a DNS request for a GSLB domian bound to the RADIUS GSLB virtual server.

[From Build 67.12]

[# 642791]

Memory usage can build up if GSLB sites attempt to exchange metric information when no TCP window is available. With this fix, GSLB sites exchange metric information only when a TCP window is available.

[From Build 71.24]

[# 657559, 658997]

In a GSLB high availability setup, if a node stays in secondary state for more than 249 days, the service state might not be updated on this node after it becomes the primary node.

[From Build 69.123]

[# 658093]

High Availability

The HA traffic between the HA pair is abnormally high. This issue is caused by a loop that repeatedly tries to push the same sessions to the secondary appliance after failover.

[From Build 63.16]

[# 560640, 566710, 576012, 576096, 579037, 582354, 590730]

When there is a HA issue, the synchronization of persistence sessions between the primary and secondary appliances can fail. This can cause some of the persistence sessions not being replicated on the secondary appliance.

When there is a HA issue, the synchronization of persistence sessions between the primary and secondary appliances can fail. This can cause some of the persistence sessions not being replicated on the secondary appliance.

Insight Center

If integrated cache is enabled on a NetScaler appliance running software version 11.0-65.x or earlier, web insight reports are not available in the Insight Center.

[From Build 66.11]

[# 631677]

Integrated Cache

A VPX system can repeatedly fail if HA cache persistence is used along with HTML-injection.

[From Build 65.35]

[# 581598]

The NetScaler can stop responding when cache object persistency is configured in a HA setup.

[From Build 65.35]

[# 589322]

When a NetScaler appliance uses a flash cache with HTTPS traffic, only the initial client request is serviced. Subsequent client requests fail.

[From Build 65.35]

[# 602984]

A NetScaler appliance performing integrated caching becomes unresponsive if the length of the URL is 2040 (including the hostname, query parameter, and other specific information).

[From Build 65.35]

[# 605831, 612030, 612102]

When the "clear config" command is issued, the NetScaler appliance can become unresponsive if more than one CPU tries to free the same shared memory.

[From Build 65.35]

[# 609928]

Disabling the Media Classification mode, even if the host header is missing in the GET request, does not cause a NetScaler appliance to fail.

[From Build 65.35]

[# 616021, 616757, 618970, 624338]

The NetScaler Integrated Cache might delay processing of client requests if you enable the flash cache.

[From Build 71.24]

[# 681664]

Integrated Caching

If you set the PINNED option for a cache content group, caching continues in this group even if the group uses more than its allocated memory, until the integrated caching memory is exhausted. Because cached objects in these groups cannot be removed until the appliance is restarted, there might be a situation in which no more objects can be cached and the appliance resets the connections of clients who send additional requests.

[From Build 66.11]

[# 621356, 631356]

A NetScaler appliance fails if a Page Tracking session is enabled on the appliance by Appflow or AppQoE modules for partial content responses. This happens only for partial content responses served from Integrated Cache.

[From Build 70.16]

[# 656556]

Load Balancing

In a link load balancing (LLB) deployment, if persistence is enabled on a NetScaler appliance and a policy based routing (PBR) or LB route is configured, the appliance might fail intermittently.

[From Build 64.34]

[# 554841]

A secure StoreFront monitor intermittently fails to sends probes.

[From Build 64.34]

[# 559164, 582153]

While probing the back-end HTTP server by using an HTTP monitor, the appliance does not send the port number in the HTTP host header. This behavior is not compliant with RFC 2616.

[From Build 64.34]

[# 564295]

In certain cases, if the name of an FTP virtual server is greater than 32 characters, the virtual server lookup fails and the request is not served.

[From Build 64.34]

[# 566644]

In a link load balancing (LLB) deployment, if persistence is enabled on a NetScaler appliance and a policy based routing (PBR) or LB route is configured, the appliance might fail intermittently.

[From Build 64.34]

[# 574137]

If an SSL monitor is bound to a domain-based service that is configured with non-default SSL settings, the monitor might not show the service as UP.

[From Build 63.16]

[# 575171, 576012]

The appliance fails if non-reachable autoscale entities that are part of a service group later become reachable and, in the interim, the service group name has changed.

[From Build 63.16]

[# 583647]

In a load balancing group configuration, the "sh run" command sometimes runs in a loop, which exponentially increases the size of the temporary configuration file. As a result, saving the configuration and synchronizing the nodes in a high availability setup might fail.

[From Build 63.16]

[# 587812, 598499, 601918]

When editing a service group in the configuration utility, the cacheable option is automatically set to true.

[From Build 63.16]

[# 592235]

If a NetScaler appliance that is experiencing an error condition (due to rate limiting/stream analytics) receives and processes an ICMP packet, the appliance might go into the DOWN state.

[From Build 64.34]

[# 595915, 602701]

If a NetScaler appliance that is experiencing an error condition (due to rate limiting/stream analytics) receives and processes an ICMP packet, the appliance might go into the DOWN state.

[From Build 71.24]

[# 595915, 602701, 659024, 664737]

If the channel between the primary node and the secondary node is disrupted, the session deletion information sent from the primary node to the secondary node might get lost. As a result, while the persistent sessions are reduced to zero on the primary node, the secondary node reaches its limit.

[From Build 64.34]

[# 596524, 597295]

The NetScaler appliance fails because of an incorrect initialization of template size in a stream analytics session info record.

[From Build 65.35]

[# 598391]

In a high availability setup, if a large number of services and service groups are configured, service state updates might fail because of a timer issue.

[From Build 64.34]

[# 605596, 609999]

In a high availability setup, if a large number of services and service groups are configured, service state updates might fail because of a timer issue.

[From Build 65.35]

[# 605596, 609999]

The NetScaler appliance fails while trying to load balance a request that was received on a recently closed connection. This happens because the server tries to keep the connection alive by sending an RTSP request but the appliance cannot find the corresponding client side connection.

[From Build 65.35]

[# 612943]

In rare cases, during a high level of CPU usage, if you disable and enable a service with zero delay, the state of the service might be inconsistent on different packet engines.

[From Build 67.12]

[# 622807]

If the same IP address is assigned to both a GSLB service and a load balancing virtual server, the NetScaler appliance dumps core and restarts, because the internal service weight is set to zero.

[From Build 69.123]

[# 628937]

In a high availability setup in admin partition mode, the persistent sessions are not synchronised to the secondary node after performing force ha sync or force failover operation.

[From Build 65.35]

[# 630344]

A secure HTTP-ECV monitor might time out if the back-end server sends a large certificate.

[From Build 68.10]

[# 638148]

A secure HTTP-ECV monitor might time out if the back-end server sends a large certificate.

[From Build 68.11]

[# 638148]

In a high availability (HA) setup, after a forced HA synchronization, the configuration is first cleared and then reapplied on the secondary node. As part of the synchronization operation, the service state changes are logged in the ns.log file. Repeated forced synchronizations can flood the ns.log file. However, the service state messages are applicable only to the primary node and not relevant to the secondary node. Therefore, these messages are not logged in the ns.log file on the secondary node.

[From Build 69.123]

[# 645197]

In the SAML response, the RelayState field is truncated. When the samlidp feature is processed, the URL decodes the entire content before parsing for individual elements. The customer's service provider sends the RelayState that was encoded. When the service provider posts the assertion back, the RelayState is truncated resulting in an SP failure.

[From Build 68.11]

[# 648337]

In the SAML response, the RelayState field is truncated. When the samlidp feature is processed, the URL decodes the entire content before parsing for individual elements. The customer's service provider sends the RelayState that was encoded. When the service provider posts the assertion back, the RelayState is truncated resulting in an SP failure.

[From Build 68.10]

[# 648337]

The NetScaler appliance fails to send an assertion back to the service provider when the SAML request comes without an ID field. When behaving as a samlidp, the ID field from the authnReq is remembered, so it can be sent back in the assertion. When service providers do not send IDs, we used to fail due to a logic error.

[From Build 68.10]

[# 648489]

The NetScaler appliance fails to send an assertion back to the service provider when the SAML request comes without an ID field. When behaving as a samlidp, the ID field from the authnReq is remembered, so it can be sent back in the assertion. When service providers do not send IDs, we used to fail due to a logic error.

[From Build 68.11]

[# 648489]

In a cluster setup, the configuration of a service might be lost if you restart the appliance after you have configured a request timeout action (-reqTimeoutAction) in an HTTP profile and attached the profile to the service.

[From Build 70.16]

[# 649994, 649940]

The NetScaler appliance dumps core and restarts if an autoscale service group is configured with SSL as the service type.

[From Build 69.123]

[# 656734]

The NetScaler appliance dumps core and restarts if an autoscale service group is configured with SSL as the service type.

[From Build 70.16]

[# 656734]

If the RelayState value for a SAML Authentication request is more than 512 bytes but less than 1024 bytes, the SAML IdP server causes the buffer to overrun when sending an assertion after successful authentication.

[From Build 69.123]

[# 656779, 663610, 664051, 664056, 664765]

If a GSLB service goes DOWN and then returns to the UP state, the configured hash-based load balancing methods might produce incorrect load balancing decisions, because the cache maintained for hash-based load balancing algorithms is not cleared when the GSLB service state is updated through MEP.

[From Build 69.123]

[# 658463, 658940]

The NetScaler appliance might become unresponsive because of an internal issue related to CRC check if custom monitors are configured for a load balancing configuration of type TFTP.

[From Build 70.16]

[# 658860]

The NetScaler appliance dumps core and restarts if all of the following conditions are met:

- You are using Citrix Receiver or a web browser to access the NetScaler Gateway appliance.

- An optimal XenApp/XenDesktop is launched by using determine_services in the policy expression.

- Static proximity is used to create a preferred list of Desktop Delivery Controllers and this information is forwarded to the StoreFront.

- Your connection is terminated or disconnected while the determine_services policy is being evaluated.

[From Build 70.16]

[# 668766, 672752]

An error message appears when the Test Connectivity button is clicked for FQDN based LDAP/RADIUS servers.

[From Build 70.16]

[# 671494]

In a high availability (HA) setup, if domain-based services are configured and the secondary node does not receive any Service State Sync (SSS) update for the services for more than 247 days, a packet engine might crash when this node becomes the primary node.

[From Build 71.24]

[# 673446, 684550, 688305]

A spillover trap might be sent even though a backup virtual server is not configured.

With this fix, a spillover trap is sent only if one of the following conditions applies:

- A spillover method or policy is configured.

- No spillover method or policy is configured, but a backup virtual server is configured to accept the traffic when the primary virtual server is DOWN.

[From Build 71.24]

[# 679991]

The maximum string size of Target Vserver Expression is 1500. If the configuration includes an expression greater than 1500, the NetScaler appliance crashes. With this fix, the maximum string size of Target Vserver Expression is limited to 1499.

[From Build 71.24]

[# 684131]

In a high availability (HA) setup, an unusually large spike in the number of persistent connections might result in underperformance of the Secure Socket Funneling (SSF) channel between the primary node and the secondary node. The underperformance can eventually lead to session buildup on the primary node and cause persistence to fail.

[From Build 71.24]

[# 685179, 684834, 694238]

Resetting a server connection resets the connections to all services configured with the same IP address and port number. As a result, connections to the service group members are also reset. With this fix, deleting a service that has the same IP address and port number as that of other service group members does not affect the service group connections.

[From Build 71.24]

[# 685707]

If an add lb monitor command specifies an httprequest argument value of more than 77 characters, a subsequent show command shows an incorrect httprequest value for the HTTP requests that the monitor sends to the CLIP address. The NetScaler appliance's ns.conf file also contains the incorrect httprequest value for the monitor. Also, the other nodes (non-CCO) in the cluster are updated with the incorrect httprequest value by the configsync process.

[From Build 71.24]

[# 685856, 687784]

The NetScaler appliance might crash if deletion of a service item and display of the service item are executed in parallel.

[From Build 71.24]

[# 691507]

NITRO

When using the NITRO API to upload a file, make sure that each directory in the file path has the 755 (read, write, execute) permission.

For example, to upload a file to the "/nsconfig/ssl/" directory, the following directories must have the 755 permission:

- flash (because the "/nsconfig" folder is actually a link to "/flash/nsconfig/" directory)

- nsconfig

- ssl

[From Build 69.123]

[# 591970, 597032]

The .NET SDK GET call fails with the following exception if it is made with a parameter that accepts boolean values:

Invalid argument value [<attribute>].

Example:

When the “internal” attribute of service_args is set to “true”, a get on service_args yields the following exception:

Invalid argument value [internal]

[From Build 71.24]

[# 595938]

An error message "Session Limit exceeded" might appear if you send a new NITRO API logon request to the NetScaler appliance, and when both of the following conditions are met:

1. A session has expired but has not yet been cleared on the appliance, and a request is sent by using the same session.

2. The above condition occurs 1000 times.

(This issue was fixed in 11.0 67.x)

[From Build 69.123]

[# 610351, 616105]

NITRO API

The NetScaler appliance might become unresponsive when a NITRO request is fetching a large number of bound entities.

[From Build 64.34]

[# 530805, 562748, 567856]

For the .NET SDK, when "nitro.dll" is used along with a version later than 4.0 of the "Newtonsoft.json.dll" file, "private" properties cannot be serialized.

[From Build 63.16]

[# 567162, 571309]

The TCP connection is not persistent for NITRO requests. Therefore, the underlying TCP connection is getting closed for each NITRO request.

[From Build 63.16]

[# 583395, 457969]

If a large number of concurrent NITRO requests are issued, many requests time out.

[From Build 66.11]

[# 616433]

If the NetScaler appliance receives a logon request that contains both the session token and the request payload with the logon credentials, the appliance creates a new connection without closing the previous connection. If the appliance receives multiple such requests, the following error message appears: CFE limit exceeded.

[From Build 65.35]

[# 620458, 619154, 621601]

NetScaler Appliance

Different languages use different keyboard layouts, causing problems with using special characters through the LOM console. With this fix, the LOM console supports additional keyboard layouts and keyboard control tools.

To change the keyboard layout, in the console, navigate to options > preferences and select a language.

[From Build 65.35]

[# 583263, 601405]

NetScaler GUI

Usability Support to Upload Technical Support Collector Archive

You can now automatically upload the technical support collector archive to Citrix Support servers.

The Goto Priority Expression field is missing for a Traffic Management session policy bound to a AAA user or group under Netscaler > Security > AAA > Policies > Session.

[From Build 66.11]

[# 629828]

If you specify an invoke label, such as policy label or virtual server, in your policy you cannot view the details of the invoke label directly.

[From Build 67.12]

[# 635940]

The strongpassword command might fail if a strong password validation is done when the password length is Zero. And when the strongpassword command fails, there is a configuration loss.

[From Build 67.12]

[# 638190, 647387]

The NetScaler GUI displays exponent 3 and key size 1024 when you try to create a FIPS key, but these options are not supported.

Also, you cannot create a key of size 3072 from the GUI.

[From Build 69.123]

[# 639154, 654952]

The details of a custom monitor bound to a service group are not displayed correctly in the NetScaler GUI. The details appear correctly in the CLI.

[From Build 67.12]

[# 640332]

If you disable the GSLB feature on a NetScaler appliance, the load balancing feature is automatically disabled.

[From Build 67.12]

[# 643191]

You cannot unbind a transform policy from a virtual server by using the GUI.

[From Build 70.16]

[# 652579]

If you try to bind a default load balancing virtual server to a content switching virtual server in an admin partition, the following error message appears:

Operation not permitted.

[From Build 69.123]

[# 653058]

The download JRE link provided in the Install WebFront page is broken.

[From Build 69.123]

[# 654196]

NetScaler Gateway

If group extraction authentication policies are configured and the Authentication subsystem is unexpectedly restarted, the group extraction policies are not sent to the Authentication subsystem. Therefore, the group extraction policies are not evaluated during authentication attempts.

[From Build 65.35]

[# 456724, 606332]

The NetScaler counters, used to verify connected users, displays a value that does not reflect actual connections.

[From Build 63.16]

[# 490991, 398874]

Adding a proxy server to a NetScaler Gateway traffic policy causes monitoring every five seconds. This can cause excessive monitoring of network packets.

[From Build 66.11]

[# 525964, 511552]

When configuring DTLS to be ON on an existing virtual server, unbind and rebind the SSL cert-key pair bound to the virtual server to connect with DTLS. If this is not done, the DTLS connection handshake between the client and the NetScaler Gateway appliance fails. After rebinding the SSL certkey pair, the handshake is accepted and the DTLS traffic goes through.

[From Build 64.34]

[# 532891, 604570]

The RDP Proxy feature on NetScaler Gateway now requires special licensing, and needs to be explicitly enabled using the 'enable feature rdpproxy' command. In addition, the 'psk' attribute, used to protect the user information sent to the STA server, is now mandatory whenever a rdpserverprofile is configured.

[From Build 64.34]

[# 543064, 518094, 527616]

Two NetScale appliances rebooted themselves because the TACACS accounting code crashed. The crash occurred due to the presence of an invalid flag in the clientPCB.

[From Build 64.34]

[# 546122]

Users are blocked from sending Calendar invitations through the CVPN using owa2013. However, if the user inserts or attaches any type document, they are able to send a calendar invitation.

[From Build 69.123]

[# 546947, 620494]

If you create a la portal theme, avoid using a name with spaces. Use an underscore instead of a space.

[From Build 62.10]

[# 548269]

Clearing the configuration does not remove the Themes directory from the NetScaler appliance's drive. If you want to remove this directory, use the shell to delete it from the following path:

/var/netscaler/logon/themes/

To remove just the EULA-string nodes, delete them from the following path:

/var/netscaler/logon/themes/EULA/resources

[From Build 62.10]

[# 549128]

Terminal Access Controller Access Control System (TACACS) counting sometimes causes memory corruption and the authentication daemon crashes. Multiple crashes of the authentication daemon lead to the NetScaler rebooting.

[From Build 64.34]

[# 550695, 594062]

In a double hop setup, when SSL relay is enabled for XenApp and XenDesktop, the XenApp or XenDesktop resource launch fails. The builds affected: 10.1-118.X to 10.5-55.8.

[From Build 62.10]

[# 550877]

In a double hop setup, when SSL relay is enabled for XenApp and XenDesktop, the XenApp or XenDesktop resource launch fails. The following builds are affected: 10.1-118.X to 10.5-55.8.

[From Build 64.34]

[# 550877]

An internet connection is required for publisher verification for the NetScaler Gateway plug-in for Windows. If not connected to the internet when downloading the plug-in from the NetScaler Gateway, the error 'Publisher AGEE_setup.exe couldn't be verified' occurs.

[From Build 62.10]

[# 553463, 558963]

If NetScaler Gateway is used to access SSL backend resources over Clientless VPN (CVPN) or SecureBrowse mode using a forward proxy, then in the event that client/browser is very slow in sending POST requests to gateway, the request times out.

[From Build 62.10]

[# 557909]

EULA feature: The EULA on a fresh HyperV image issues an error. It works fine for upgraded builds.

[From Build 62.10]

[# 564048]

NetScaler Gateway sends the wrong error code back to the user when the active directory password has expired, and the user tries to change the password and violates password complexity rules.

[From Build 64.34]

[# 564885, 593869, 606564]

When accessing SharePoint 2007 through Clientless VPN, the VPN session terminates, and some URL requests are not rewritten in Clientless VPN mode.

[From Build 62.10]

[# 567887]

Smart Control does not work for applications that have SSL relay enabled on the server with few ICAPOLICY rules.

[From Build 63.16]

[# 570437]

Smart Control does not work for applications that have SSL relay enabled on the server with few ICAPOLICY rules.

[From Build 64.34]

[# 570437]

App/VDA launch via HTML5 receiver fails when using Firefox.

[From Build 62.10]

[# 570690]

An unintentional automatic Linux exit happens under the following conditions:

* The NetScaler appliance is configured for dual, certificate authentication and LDAP authentication.

* The subject field of the client certificate doesn't contain an email attribute value.

[From Build 62.10]

[# 571281]

The Locale settings have been moved out of the Look and Feel section. Now, we have 2 separate sections :

- Section 1 is for settings the attributes related to the Look and Feel of portal pages.

- Section 2 is for choosing a locale.

Users can choose a locale to edit labels/texts for portal pages.

[From Build 62.10]

[# 571754]

Applicable only for Mac VPN clients

Chrome is phasing out NPAPI support. From Chrome version 42+ all NPAPI plugins will appear as if they are not installed. This will affect all existing customers. Affected customers will see a download prompt even though the VPN plugin is installed.

The Portal Customization feature does not offer the option to cancel or remove the default GUI or custom GUI images.

[From Build 63.16]

[# 572723, 555553]

Audio over UDP is not supported with ICA sessiontimeout enabled or with Smart Control.

[From Build 63.16]

[# 572850]

An error message is issued when a user tries to bind a CS policy to the VPN virtual server (CS-AG feature). The CS policy points to a VPN virtual server (Unified-Gateway feature). This is an expected behavior. The error message was improved to convey that it is an expected behavior.

[From Build 62.10]

[# 572889]

The Mac OS Endpoint Analysis (EPA) client only supports TLS1.0 and thus cannot perform EPA if the server has only TLS1.1/1.2 enabled.

There is no workaround for this problem, but a customer can still perform EPA with the Mac VPN plugin. EPA from a browser will not be available if TLS1.0 is not enabled.

[From Build 63.16]

[# 572969]

The Total AAA Session Graph always shows 5 sessions active; even when, there are no active AAA sessions.

[From Build 62.10]

[# 573304]

When a user in the INTL domain logs on through a NetScaler appliance (a dual factor with RADIUS) by entering only a user name (no domain information on the logon page), the logon fails. However, the same kind of logon attempt by a user in the Corp domain is successful. This behavior is expected. Storefront needs the domain and user-name information from a user in the INTL domain. When entering domain\username format on the NetScaler login page, RADIUS rejects the login, and it does not pass the domain and user-name information to the Storefront server, so the logon fails.

[From Build 65.35]

[# 573406]

When users from INTL domain login via NetScaler ( a dual factor with RADIUS) by entering username only (no domain information in the login page) it fails. When users from Corp domain login via NetScaler (dual factor RADIUS) by entering username only (no domain information in the logon page) it works. The above is expected behavior. Storefront needs the domain\username information when a user from INTL domain logon. When entering domain\username format on the NetScaler login page, RADIUS rejects the login, and it does not pass the domain\username information to the Storefront server, so the login fails.

[From Build 64.34]

[# 573406]

In a Chrome browser, the home page is sometimes blank. Refreshing the page resolves the issue.

[From Build 62.10]

[# 574173]

The Client and EPA Plug-ins don't work with the latest Chrome versions as support for NPAPI is disabled by default. The support will be deprecated entirely in Chrome version 45 in September 2015.

From Chrome version 42, all NPAPI plugins will appear as if they are not installed. This will affect customers upgrading from 10.5 to 11.0. This is also applicable to customers who upgrade from 11.0 Beta builds and later Release builds. Affected customers will see a download prompt even though the VPN or EPA plugin is installed.

[From Build 63.16]

[# 574355]

When a user tries to access the system and if that connection gets terminated while authentication is in progress, NetScaler might fail.

[From Build 64.34]

[# 574377]

When the HTTP/2 Protocol is used to access the VPN with external authentication, the transaction will not go through. Ensure HTTP/2 is disabled in nshttp_default_strict_profile.

[From Build 62.10]

[# 574742]

Applications configured with SAML or NetScaler self-authentication, on a Unified Gateway portal, return the following 403 error message : Not a privileged user.

[From Build 62.10]

[# 574949, 575938]

If an invalid certificate is selected as part of login, when certificate Authentication is optional, and two factor authentication is ON, the login fails as expected. But an app saves the certificate, though login failed. The user has to manually delete the saved certificate from the EditConnection Page to retry with a valid/no certificate.

[From Build 63.16]

[# 575047]

The Expression editor is missing the following new policy expressions: ICA.SERVER.IP, ICA.SERVER.IPV6, ICA.SERVER.PORT.

[From Build 62.10]

[# 575468]

Some Unified Gateway traffic management session do not terminate at VPN logout.

[From Build 62.10]

[# 575512, 575521]

If Storefront has been configured as WIHome parameter, then accessing the Store Apps in Applications tab in the homepage over Full vpn mode with Windows does not work and an error message "Cannot complete your request" is returned.

[From Build 65.35]

[# 575993]

When the maxAAAUsers parameter is UNSET on a VPN virtual server, NetScaler Gateway does not update the value to previously set value. Due to this, numbers of users allowed on a vpn virtual server cannot be increased by applying an UNSET operation. Administrators need to configure a SET operation as a workaround.

For example, if the administrator configures 10 as the maxAAAUsers value, then issues a SET operation for 5, if he issues another UNSET, the number of allowed users does not go back to 10 users.

[From Build 62.10]

[# 576063]

The plug-in crashes when VPN logout is performed from browser.

This would cause the logout page to not load in browser which directs user to login page.

When a VPN works as a SAML SP in a two-factor case, and if the Get /vpn/index after /cgi/samlauth comes to the same core, NetScaler resends the SAML Auth request.

Intermittent issues appear in multi-core systems. It works normally if both requests go to different cores.

[From Build 62.10]

[# 576414]

When Netscaler Gateway is configured in a Striped cluster, and a force cluster sync operation is done on a NON CCO node, subsequent access can cause the NetScaler Gateway appliance to crash.

[From Build 62.10]

[# 576522]

During the installation of Logon Point, the following error message was issued: "Couldn't execute eula_upgrade.pl error".

[From Build 63.16]

[# 578144, 582708, 583061, 583300, 593263]

End users are experiencing performance degradation when connecting to their Avaya One-X via VPN connection. End users are able to establish 3-5 calls before the symptoms are exhibited. However, after a period of time, we are able to make calls again. The quality starts to decrease after the first few phone calls are made.

The workaround is to restart the VPN connection.

[From Build 64.34]

[# 578469]

A crash occurs when the packet engine is set up with an aync call with a NULL NSB pointer.

[From Build 64.34]

[# 578889]

The customer experiences long set up times when using the following plug-ins: V10.1-128.8 or V10.5-55.8. If they downgrade back to receiver plugin 10.0-54.6, the issue disappears and they see immediate VPN setup times.

[From Build 64.34]

[# 579027]

On the Windows 10 system, if users log off from the NetScaler Gateway portal, the Windows VPN plugin crashes intermittently. As a workaround, users may use the VPN plugin's context menu for logging-out.

[From Build 64.34]

[# 579788, 572866, 581274]

When logging into NetScaler 11.0 using a clientless VPN, SharePoint 2013 does not load correctly. The SharePoint folders are not accessible.

[From Build 62.10]

[# 580737]

If PKINIT is employed in XenMobile deployment to obtain Kerberos tickets for backend servers using Netscaler Gateway and WorxHome, then SingleSignOn to Kerberos sites fails intermittently.

[From Build 67.12]

[# 581106]

Perl script was modified to avoid a variable used for the password.

[From Build 66.11]

[# 581861]

When launching applications through NetScaler Gateway, which has an AppFlow policy bound with the type of OTHERTCP_REQUEST, the Gateway can fail. This failure is not seen if the AppFlow policy is bound with the type ICA_REQUEST.

[From Build 62.10]

[# 582075]

When launching applications through NetScaler Gateway, which has an AppFlow policy bound with the type of OTHERTCP_REQUEST, the Gateway can fail. This failure is not seen if the AppFlow policy is bound with the type ICA_REQUEST.

[From Build 63.16]

[# 582075, 587347]

The Federated Service SSO fails when using the browser to access the NetScaler appliance.

[From Build 64.34]

[# 582973]

If a user logs into a receiver on a machine, which is configured to use an AutoProxy Script, and that AutoProxy script URL is unreachable, the login fails.

[From Build 64.34]

[# 585722]

The DNS server fails to resolve internal URLs without an FQDN when using WorxWeb on Android devices.

[From Build 65.35]

[# 586475]

Changes made to the Login page using the GUI are not reflected on the virtual server login page.

[From Build 63.16]

[# 586483]

If the WI home is configured with FQDN, NetScaler modifies the host header with the IP address of the WI server when sending traffic to WI server. Similarly, if wihome is configured with the IP address, that IP address is sent in the host header to the WI server. In both these cases, the WI server returns an error.

After the fix, the host header is updated to the FQDN in the wihome as opposed to IPaddress. In cases where wihome FQDN resolves to the domain based server on Netscaler, The host header is updated with the FQDN of the domain based server

[From Build 64.34]

[# 586921, 586949, 598624]

The NetScaler appliance experienced a system error due to a memory corruption issue.

[From Build 64.34]

[# 587825]

Users appear to lose their connections to Storefront. The user has to disconnect and reconnect to the server.

[From Build 65.35]

[# 588116]

If the client timeout interval is too long (for example, 12 hours), a memory allocation problem results in user disconnections and login failures.

[From Build 65.35]

[# 590561, 598429]

When the NetScaler Gateway virtual server is bound to a Content Switching virtual server, all web socket connections are passed to the NetScaler Gateway virtual server.

[From Build 64.34]

[# 592828]

RPC (Remote Procedure Call) over HTTP communication is blocked if the AppFlow or HTML Injection features are enabled.

[From Build 63.16]

[# 592904, 593008, 594149, 595496]

RPC (Remote Procedure Call) over HTTP communication is blocked if the AppFlow or HTML Injection features are enabled.

[From Build 64.34]

[# 592904, 593008, 594149, 595496]

Client traffic can slow down if ALL of the following conditions are satisfied:

- Single Sign-on (SSO) is ON.

- HTTP POST request is involved which requires to do SSO.

- NTLM authentication is needed to authenticate to back-end.

- Transferring large payload (greater than 2 MB).

- The back-end server is responding slow.

This issue is unlikely to occur if ANY ONE of the following conditions is satisfied:

With ICA policies configured or with ICA session timeout enabled and with Storefront 3.0 configured, Apps/Desktops won't launch because of a change in Storefront behavior that the Netscaler is not handling.

[From Build 64.34]

[# 593023, 593026, 597946]

The user's session cookie is no longer accessible to rewrite and other modules. Customers cannot insert the session cookie as an HTTP header and send it to back-end servers. This change provides an alternative way to check for AAA cookie presence by using HTTP.REQ.USER.SESSIONID expression. It results in a non-empty string if an AAA session exists. This is equivalent to checking for a valid AAA cookie.

[From Build 65.35]

[# 593256, 624882]

The RDP Proxy messages were enhanced to include information concerning the controls that are in place at the connection.

[From Build 64.34]

[# 593412]

If you remove a Negotiate authentication profile that is available on NetScaler Gateway, the appliance can fail when checking for incorrect IPv6 mapping.

[From Build 64.34]

[# 594224, 595596]

Certificate authentication does not work from the CLI if the Client Authentication option is not set on the NetScaler Gateway Virtual Server. Using NSGClient, it only works if you do the following: enter Preferences/Configuration, enter the Password for the certificate, and log in.

If CISCO ACS or any TACACS server is used to authorize command execution for NetScaler, executing lengthy CLI commands (>1460 bytes) results in the following ERROR: "Not authorized to execute this command." This issue occurs most frequently with the "set appfw profile" command, because of the large number of parameters, but it can occur with any lengthy CLI command. Frequently used commands are typically less than 1460 bytes, so the issue does not occur very often.

[From Build 65.35]

[# 596184, 519898]

When connected to the NetScaler Gateway, NSGClient adds a space before the following IP address: /etc/hosts file. The customer monitors suspicious entries and removes them. The space before the IP address is considered suspicious and is removed, so NSGClient cannot work.

[From Build 65.35]

[# 596525]

ClientCertPath is not read when a client uses the GUI to connect to NSGClient. The client certificate is repeatedly requested, even if the GUI is configured to provide it.

[From Build 65.35]

[# 596530]

After the user name is extracted from a certificate, the UserName field is not grayed out in GUI and is open for editing.

[From Build 65.35]

[# 596705]

Client certificate Authentication processing stops if the Subject field of a Client certificate is left blank.

[From Build 68.11]

[# 596802]

Client certificate Authentication processing stops if the Subject field of a Client certificate is left blank.

[From Build 68.10]

[# 596802]

While assigning an IntranetIP, if Netscaler Gateway finds a duplicate, it cleans up associated session. In this process, occasionally Gateway might fail.

[From Build 64.34]

[# 596826]

Applications using more than 128 simultaneous connections over VPN fail on Windows machines.

[From Build 64.34]

[# 596994]

In Unified Gateway deployment, if there are no matching Content Switching policies for the storefront requests in ICA Proxy mode, and default Load Balancing is used for serving this traffic, the NetScaler appliance might fail.

[From Build 64.34]

[# 597556]

For a VPN virtual server with ipaddress -0.0.0.0, listen policies and services are not allowed to be set. The NetScaler appliance terminated due to invalid memory access.

[From Build 64.34]

[# 597615]

The computer termination happened because the server-info corresponding to WI-Home configuration was freed and reused.

[From Build 67.12]

[# 597647, 593724, 606509, 606774, 624072]

If SSL SessionReuse is enabled on Gateway virtual server, if a user cancels certificate authentication prompt at the time of login, he sees an error. However, at times, a browser refresh shows login page and allows access.

[From Build 64.34]

[# 597963]

The client receiver is not sending an authentication cookie back on previously authenticated connection due to this the NetScaler appliance is sending a 403 error to the client.

[From Build 65.35]

[# 598478]

The NetScaler appliance connected to the Linux SSL VPN client, but could not connect to the DNS lookups. After a reboot of the appliance, the NetScaler appliance connected to the Linux SSL VPN client and the DNS lookups worked fine.

[From Build 64.34]

[# 599410]

If Netscaler Gateway is configured with SmartControl, the SmartControl Policies are not applied for some network conditions that cause the ICA packets to be fragmented when they reach the Gateway.

[From Build 66.11]

[# 599803]

The NetScaler appliance crashed due to invalid memory access. The memory allocation failure occurred due to a bug processing a cookie.

[From Build 64.34]

[# 601668]

If SSO is enabled on an AAA TM or Gateway configuration, the NetScaler appliance might fail.

If group extraction authentication policies are configured, and the Authentication Subsystem is unexpectedly restarted, the group extraction policies are not sent to the Authentication Subsystem on restart. The group extraction policies won't be evaluated during authentication attempts.

[From Build 65.35]

[# 606332]

If the HTTP connection stats are printed from a CPU other than the one from which the session originated, the TCP port for the HTTP traffic sent over the VPN is displayed incorrectly.

[From Build 65.35]

[# 607213]

The clear config function does not clear the default DNS profile or the comand, tm sessionpolicy, from the packet engine. When the bulletins are applied as part of clear config command, the add dns profile and add tm sessionpolicy command fail.

[From Build 65.35]

[# 607413, 597550, 602417, 611607, 615573]

You cannot bind an ECC curve to a NetScaler Gateway virtual server by using the NetScaler GUI.

[From Build 64.34]

[# 607474]

Single sign on (SSO) for the NavUI file share view does not honor the ssocredential configuration on the authentication action, and instead sends only the username from the authentication session. If a domain is configured to accept something other than the session username, SSO will fail. This fix makes NavUI file share properly honor the ssocredential setting and send what the administrator has configured.

If the new session entry points to the same memory that was used for a previous session entry earlier, some of the values have to be reset.

[From Build 65.35]

[# 608791]

Single-sign-on to backend servers through an MPX-FIPS device sometimes fails.

[From Build 65.35]

[# 611109, 612407, 613885, 614514]

Smart access policies based on smart group rules do not work for existing sessions after HA failover, because Smartgroups and externalgroups are not synced to the secondary during session transfer.

[From Build 65.35]

[# 611202]

The NetScaler Gateway plug-in for windows issues a force timeout warning with an incorrect timeout value. Even though the incorrect time is shown in the warning, the session is terminated correctly after a forced timeout.

[From Build 65.35]

[# 611343]

Destination IP based authorization policies do not work as expected in ICA Proxy Mode. Users see authorization failures despite having an authorization policy that allows traffic destined to Storefront server's IP address. As a workaround, Host header based authorization policy or user membership based policies can be used.

[From Build 65.35]

[# 611534]

The EPA plugin window is now at the top of the screen. Its new position facilitates the user-consent step, especially for new users. The change does not affect EPA scanning.

[From Build 65.35]

[# 612144]

The minimum and maximum value checks for RDP Cookie validity do not work as expected.

[From Build 65.35]

[# 612260]

The NetScaler appliance inserts an NS_ESNS cookie for page tracking (for showing a waterfall chart) when AppFlow is enabled. Cookie insertion was controlled by the clientSideMeasurements option in the appflow action in release 10.5, but in release 11.0 the default became to always insert the cookie when appflow is enabled. Android receiver (HTTP client) was not able to handle this cookie. This fix adds the Enable/Disable page tracking (cookie insertion) option to the appflow action.

[From Build 65.35]

[# 613351, 598478, 608448]

The pre-auth EPA scan for F-Secure antivirus fails.

[From Build 66.11]

[# 613648]

Destination IP based expressions cannot be used for traffic policies that use SecureBrowse and CVPN modes.

[From Build 65.35]

[# 614970]

After hotfix 32 was deployed on the XenDesktop 7.1/7.6, end users had intermittent issues reconnecting to disconnected VDA sessions through the their external portal when going through SSLRelay and in non-session reliability mode.

[From Build 67.12]

[# 615364, 613266]

This is a summary of how NS 11.0 behaves on FIPS systems with respect to RADIUS and TACACS policies. RADIUS & TACACS use non-FIPS algorithms which are not permitted if fipsUserMode is ENABLED. The default setting for fipsUserMode is DISABLED.

In 55.x/62.x/63.x GA builds:

- Config behavior: RADIUS & TACACS policies can be created.

- Runtime behavior: Possible system failure if fipsUserMode is ENABLED and a RADIUS or TACACS action is attempted.

In 64.34 GA build, 64.35 LCM build:

- Config behavior: RADIUS & TACACS policies cannot be created.

- Runtime behavior: no system failure.

In 64.36, 65.x GA Build:

- Config behavior: RADIUS & TACACS policies cannot be created if fipsUserMode is ENABLED. If fipsUserMode is DISABLED then RADIUS & TACACS policies can be created.

- Runtime behavior: no system failure.

[From Build 65.35]

[# 615909]

If the intranet application feature is enabled, the NetScaler Gateway plug-in intermittently takes more than 2 minutes to complete a logout.

[From Build 65.35]

[# 616208]

If the STA service goes down, entries are not written to the ns.log/syslog, and SNMP traps are not sent.

[From Build 67.12]

[# 616218]

The secondary page for radius authentication does not load the appropriate fonts when using the X1 theme.

[From Build 65.35]

[# 616946]

After the upgrade, a parsing error occurred with packets on the mux channel. Because of the error, a new mux packet was tracked from a wrong offset and caused a failure.

[From Build 65.35]

[# 619321, 622466]

POST content sent by WorxWeb through SecureBrowse for forms authentication is not passed to the back-end server under the following set of conditions:

- A traffic policy is on the NetScaler appliance routes traffic coming from the WorxWeb clients that connect to a proxy through SecureBrowse.

- The proxy requires authentication for every request.

[From Build 68.10]

[# 619438]

POST content sent by WorxWeb through SecureBrowse for forms authentication is not passed to the back-end server under the following set of conditions:

- A traffic policy is on the NetScaler appliance routes traffic coming from the WorxWeb clients that connect to a proxy through SecureBrowse.

- The proxy requires authentication for every request.

[From Build 68.11]

[# 619438]

The packet processing engine fails unexpectedly during an attempt to parse missing content.

[From Build 65.35]

[# 619859]

Internet Explorer shows signature of file is invalid or corrupt when a user downloads EPA or VPN plugin. Users are advised to use a different browser (like Firefox or Google Chrome) for downloading and installing EPA or VPN plugin. After installation, users can use any browser without issues.

[From Build 65.35]

[# 620715, 625340]

LDAP referrals do not allow the AAA auth user to log on. An attempt to log on as an AAA auth user causes the NetScaler appliance to fail.

If a user on a substandard network launches an RDP Desktop through a NetScaler appliance, the user's screen might not display anything.

[From Build 65.35]

[# 622495]

Accessing PACS medical images can take several minutes to open using NetScaler full VPN.

[From Build 67.12]

[# 622802]

If an Autoproxy script is configured on a client's machine, but the Autoproxy URL in that script is inaccessible from the client's machine, the client receives a prompt to overwrite the EPA package files. This issue occurs intermittently.

[From Build 67.12]

[# 622952]

If the network between the RDP client and the NetScaler appliance is substandard, users can get a blank screen when launching a RDP desktop using Netscaler Gateway.

[From Build 65.35]

[# 622974]

If Gateway is deployed for a XenMobile use case, the webSSO between AppController and Sharefile fails intermittently due to an incorrect Host header that Gateway sends. As a workaround, a trailing slash (/) needs to be configured in the corresponding wihome configuration.

[From Build 65.35]

[# 623227]

The NetScaler appliance failed shortly after an upgrade from software release 10.1 build 129.11 to release 10.5 build 61.11. This failure is rare. It happens when core-to-core (packetEngine-to-packetEngine) copying of AAA sessions exceeds the 64KB limit.

[From Build 66.11]

[# 623228, 627034, 637123]

End Point Analysis (EPA) scan to check if the Windows update agent is enabled/disabled fails intermittently.

[From Build 66.11]

[# 623417]

A login script intermittently fails to execute if deployed on a file share that requires domain authentication, if the client machine is joined to a domain whose name is longer than 16 characters.

[From Build 66.11]

[# 623712]

The VPN incorrectly displays the total number of connected users as approximately 4 billion more than the actual number of users connected to the virtual server.

[From Build 67.12]

[# 629401, 632265]

In Linux, an EPA scan fails for scan strings that contain an underscore character (_) in the file or process name.

[From Build 67.12]

[# 629972]

NetScaler crashes if a fail over occurs with expired ICAProxy VPN session on owner core followed by session reactivation.

[From Build 67.12]

[# 630473, 631465, 633223, 643953]

The DHCP does not work when connected to VPN using the NetScaler Gateway Plug-in for Windows.

[From Build 67.12]

[# 630667]

If the system is intentionally warm rebooted, or due to another problem, the nskrb process may begin consuming 100% CPU and Kerberos authentication will cease to function. Restarting the process temporarily alleviates the issue. This is now fixed and nskrb behaves appropriately under warm restart scenarios.

[From Build 67.12]

[# 631144, 608283, 615351, 635546, 636495]

The NetScaler appliance can fail when the NetScaler Gateway is configured in full tunnel mode and tunnel compression is enabled.

[From Build 68.10]

[# 631467]

The NetScaler appliance can fail when the NetScaler Gateway is configured in full tunnel mode and tunnel compression is enabled.

[From Build 68.11]

[# 631467]

If a user's AD/LDAP password has expired, or is marked for change at the next login, the NetScaler appliance allows the user to change their AD password; even if, the password change is disabled for the LDAP configuration.

[From Build 67.12]

[# 632523]

SAMAL authentication occurs when logging into the page. When Gateway accesses the page, LDAP authentication takes place. After entering the LDAP credentials, it fails with an "access denied" error.

[From Build 67.12]

[# 632560]

The Logout script, hosted on the network share, does not execute if the user logs out from the NetScaler Gateway Portal page.

[From Build 67.12]

[# 632721]

If using the RDP Proxy feature to generate a .rdp file, the client connection stops transmitting data if the first bound STA server is DOWN.

[From Build 67.12]

[# 633343]

The "Cookie Validity Period" for RDP Proxy is configured for 60 seconds (add rdp clientprofile [...] -rdpCookieValidity 60). However, connections are allowed for 5 minutes in stateless for the second NetScaler RDP Proxy deployments. The RDP Proxy "Cookie Validity Period" is not honored.

Replay detection does not work when the VPN virtual server is configured for SAML Authentication.

[From Build 68.10]

[# 639021]

Replay detection does not work when the VPN virtual server is configured for SAML Authentication.

[From Build 68.11]

[# 639021]

IDP initiated redirect binding does not work when the VPN virtual server is a SAML service provider. If you attempt redirect binding, the following error message is issued: Matching policy not found while trying to process Assertion; Please contact your administrator.

[From Build 68.10]

[# 639022]

IDP initiated redirect binding does not work when the VPN virtual server is a SAML service provider. If you attempt redirect binding, the following error message is issued: Matching policy not found while trying to process Assertion; Please contact your administrator.

[From Build 68.11]

[# 639022]

After upgrading the NetScaler appliance in HA-pair, the user is experiencing regular Failovers.

[From Build 67.12]

[# 639600]

The issue crops up if the backend connection(involved in the upload) is slower compared to the rate at which NSGClient sends the data. As a result, the VPN client stops sending after some time and at this point, has data in the buffer. Since the application is unaware of the situation, it re-transmits the unacknowledged packets.

The window-size in the VPN client is reduced to avoid this situation.

[From Build 67.12]

[# 640140]

A load balancer specified as the next hop in a NetScaler Gateway configuration is not included in the configuration after the appliance is restarted.

[From Build 67.12]

[# 640436]

For SmartControl to work, the Gateway login is required on the NetScaler appliance enforcing SmartControl. Storefront's session timeout causes automatic disconnections of ICA sessions launched through NetScaler Gateway if the ICA Smart Control policy is bound to the VPN virtual server. This requirement is now relaxed.

[From Build 68.10]

[# 640466, 640223, 642970]

For SmartControl to work, the Gateway login is required on the NetScaler appliance enforcing SmartControl. Storefront's session timeout causes automatic disconnections of ICA sessions launched through NetScaler Gateway if the ICA Smart Control policy is bound to the VPN virtual server. This requirement is now relaxed.

[From Build 68.11]

[# 640466, 640223, 642970]

For SmartControl to work, the Gateway login is required on the NetScaler appliance enforcing SmartControl. Storefront's session timeout causes automatic disconnections of ICA sessions launched through NetScaler Gateway if the ICA Smart Control policy is bound to the VPN virtual server. This requirement is now relaxed.

[From Build 69.123]

[# 640466, 640223, 642970]

This issue is specific to Unified-Gateway deployment. The selfauth SSO for AAA-TM applications sometime fails when the NetScaler Gateway appliance is used for authentication.

[From Build 67.12]

[# 640642]

A NetScaler Gateway appliance might occasionally fail If the AAA context/session size exceeds 64K bytes (due to a large number of groups or large Kerberos tickets).

[From Build 67.12]

[# 641324]

A segmentation fault occurs while processing an invalid HTTP header and causes the NetScaler appliance to fail.

[From Build 67.12]

[# 641395]

If DNS Truncate configuration is used, all the DNS suffixes are pushed from the NetScaler appliance, but not all of the DNS suffixes are used by the AGEE Client.

[From Build 68.10]

[# 641458, 543403]

If DNS Truncate configuration is used, all the DNS suffixes are pushed from the NetScaler appliance, but not all of the DNS suffixes are used by the AGEE Client.

In a cluster environment, the following clear-config commands do not clear the configuration: authentication policy, authentication profile, authentication binding.

[From Build 68.10]

[# 642287, 642316, 644394]

In a cluster environment, the following clear-config commands do not clear the configuration: authentication policy, authentication profile, authentication binding.

[From Build 68.11]

[# 642287, 642316, 644394]

Single sign-on (SSO) users connected to a VPN virtual server configured for SAML authentication cannot log off if Shibboleth is the SAML identity provider (IDP). Instead of the logoff page, an HTTP error message appears. This failure occurs with the following configuration:

* VPN virtual server is configured for SAML authentication.

* Shibboleth is the SAML identity provider (IDP).

[From Build 68.10]

[# 642554, 576014]

Single sign-on (SSO) users connected to a VPN virtual server configured for SAML authentication cannot log off if Shibboleth is the SAML identity provider (IDP). Instead of the logoff page, an HTTP error message appears. This failure occurs with the following configuration:

* VPN virtual server is configured for SAML authentication.

* Shibboleth is the SAML identity provider (IDP).

[From Build 68.11]

[# 642554, 576014]

The console shows many IPv4 Socks errors that are constantly being generated.

[From Build 69.123]

[# 643302, 639579, 639782]

A control channel between a NetScaler Gateway Plug-in and a NetScaler appliance is terminated if multicast IP packets are tunneled over the control channel.

[From Build 69.123]

[# 643558, 649729, 656746]

If you use NetScaler Gateway portal customization, the colors chosen for the "Form font color" field are not effective on Internet Explorer versions 10 and earlier.

[From Build 67.12]

[# 644098]

If the LDAP bind account password used on NetScaler contains a pair of dollar signs"$$", the authentication for the bind account fails, and the dashboard shows that the LDAP server is down.

[From Build 68.10]

[# 644689]

If the LDAP bind account password used on NetScaler contains a pair of dollar signs"$$", the authentication for the bind account fails, and the dashboard shows that the LDAP server is down.

Kerberos authentication can fail, and the connection might be dropped, if consumption of AAA session memory is very high. In a high availability setup, a failover might occur.

[From Build 68.11]

[# 650492]

Kerberos authentication can fail, and the connection might be dropped, if consumption of AAA session memory is very high. In a high availability setup, a failover might occur.

[From Build 68.10]

[# 650492]

The Content Switching (CS) virtual server incorrectly points to a virtual authentication server that has been removed. This happens if you set up two authentication virtual servers behind the CS virtual server, and later remove the second authentication virtual server.

[From Build 69.123]

[# 650754]

When a user accesses a VDA that resolves to load balancing virtual server on the second hop, the NetScaler appliance fails, because the server information is not reused. With this fix, new server information is created when the user is connected to an SSL load balancing virtual server on the second hop.

[From Build 69.123]

[# 650948]

Mac OSX users are unable to sign on to the OSX Receiver client and are denied access to their apps and desktops.

[From Build 68.11]

[# 651273]

Mac OSX users are unable to sign on to the OSX Receiver client and are denied access to their apps and desktops.

[From Build 68.10]

[# 651273]

When using Unified Gateway, Citrix Receiver fails to enumerate applications.

If the NetScaler appliance is used as a SAML Service Provider to support the IBM Tivoli Identity Provider, the SAML assertion verification fails. SAML assertion verification failures occur after upgrading to version 11.0.

If only nFactor certificate authentication is configured for NetScaler Gateway, a VPN session is created instead of a traffic management (TM) session for access to a load balancing virtual server.

[From Build 69.123]

[# 654466, 664533]

If you connect to NetScaler Gateway by using full tunnel VPN and attempt to access an internal URL that has Kerberos authentication enabled, the authentication fails. You are directed to the authentication screen and prompted for username and password.

The Citrix virtual adapter is not enabled on a Windows 7 64-bit machine, and its driver is shown as unsigned in the device manager.

Note: If a Windows 7 64-bit user is logged out immediately after logging in, install security patch KB3033929 on that user's Windows machine.

[From Build 69.123]

[# 655557]

Global Server Load Balancing (GSLB) HTTP cookie based persistence does not work with NetScaler Gateway SSL VPN clients when the site prefix is a substring of a GSLB domain.

[From Build 69.123]

[# 656026]

If a NetScaler appliance is used to load balance SharePoint servers with AAA-TM, then an upgrade to the office 2016 suite on the client device causes failures during inline editing of the documents.

[From Build 69.123]

[# 656067, 658202]

A NetScaler appliance might periodically restart after an upgrade if the deployment uses STA servers and, during the upgrade, the administrator's browser is closed while the appliance is communicating with a STA server.

If jumbo frames are enabled on loopback, processing of data sent by AAAd in the packetEngine can cause massive memory corruption. This happens because the TCP data in the jumbo frame exceeds the application maximum segment size (MSS).

[From Build 69.123]

[# 656994, 662324, 664318, 664591, 664837, 665693, 665865, 668202]

Processing IPv6 packets on a MUX channel while the feature is disabled leads to a device failure.

[From Build 69.123]

[# 657710]

If negotiate authentication is the first authentication factor, non-pass-through authentication in the next factor is not supported.

[From Build 69.123]

[# 657741]

The NetScaler appliance fails if it tries to clean up the control channel between the NetScaler Gateway plugin and the NetScaler appliance at a time when memory usage is high.

[From Build 69.123]

[# 658229]

A memory leak gradually diminishes the amount of memory available for SSL VPNs. The NetScaler appliance eventually fails unless it is rebooted before memory utilization reaches too high a percentage.

Upon employing WebAuth authentication mechanism for validating user credentials, if the user connection that initiated the login gets terminated after NetScaler receives response from external server but before it validates the success rule, then occasionally the NetScaler appliance fails.

For this issue to recur all of the below conditions should be met in the specified sequence.

1. WebAuth is used as authentication mechanism

2. NetScaler contacts external server using webAuth for login

3. External server responds with a valid data

4. WebAuth success rule is configured such that NetScaler waits for further data from server. Hence, it 'blocks' execution.

5. In the meantime, client connection times out, or user closes browser tab

Upon failover or after clearing the configuration, SSL connections via proxy fail if the last octet in the IP address assigned to the proxy is greater than 127.

[From Build 71.24]

[# 679412, 672306, 685958]

EPA and VPN plugin does not get launched from the latest Firefox build (52.0 or later). This happens as Firefox does not support NPAPI plugins anymore.

[From Build 71.24]

[# 679998, 682798]

Single sign-on (SSO) to SMB fileshare servers fails when a user tries to access the servers from the Fileshare tab on the portal home page. This issue occurs rarely, and only when the single sign-on credential index is set to Secondary.

[From Build 71.24]

[# 682313]

In rare cases, a NetScaler Gateway appliance becomes unresponsive after an attempt to access the portal page if the HTTP header of the request is large (possibly with google analytics enabled). A buffer overrun leads to memory corruption.

[From Build 71.24]

[# 683484]

In rare scenarios, NetScaler Gateway dumps core if you have an SSL-Proxy configured at NetScaler Gateway and you access the intranet web application through a Clientless Virtual Private Network (CVPN) via Gateway that has proxy-authentication configured at proxy.

When hundreds of users try to log on to NetScaler Gateway at about the same time, the logon page might stop loading, or it might load very slowly, in which case the logon process takes a very long time to complete.

The NetScaler appliance fails to access the Gateway home page after an upgrade to software release 11.1 build 51.21. The cause of the failure is the presence of an unexpected parameter (/ilearn).

[From Build 71.24]

[# 686715, 687092]

Some traffic patterns cause application launch through NetScaler Gateway to fail if EDT is enabled on virtual desktop applications.

[From Build 71.24]

[# 686774, 686960, 687587]

In rare cases, while accessing Gateway via proxy, NetScaler dumps core if KCD based Single Sign-On is attempted to back-end servers.

[From Build 71.24]

[# 686858]

In rare situations, VPN plug-in installation fails and a "Citrix Access Gateway is not supported on this platform" error message appears on a machine running a 64-bit operating system.

[From Build 71.24]

[# 687139, 691368]

The NetScaler appliance dumps core during core-to-core communication, because resetting the TCP connection closes the connection without cleaning the connection structure.

[From Build 71.24]

[# 687211]

In rare situations, a NetScaler Gateway appliance dumps core when processing forms based SSO to URLs larger than 4 KB.

[From Build 71.24]

[# 688842]

If a NetScaler Gateway appliance that has partitions is configured with an intranet IP address, traffic from one of the partitions to the default partition loops back to the sender instead of treating the partitioned appliance as two independent appliances.

[From Build 71.24]

[# 689907]

Signing on to an outbound proxy can cause the NetScaler appliance to dump core if Kerberos constrained delegation (KCD) is used for single sign-on.

[From Build 71.24]

[# 690388]

In rare cases, a persistent cookie can cause a NetScaler Gateway appliance in a Unified Gateway (UG) deployment to dump core.

[From Build 71.24]

[# 692079]

NetScaler Gateway Linux Client

The DNS stops working over SSL VPN on a Ubuntu machine when windows VM is started in a virtual machine.

[From Build 67.12]

[# 628546]

NetScaler ICA

When ICA AppFlow is enabled on a NetScaler appliance, some network traffic patterns might cause the appliance to become unresponsive.

[From Build 70.16]

[# 670826, 671134]

If AppFlow for ICA is enabled, some network traffic patterns, when followed by a client reconnect, might cause the appliance to become unresponsive.

[From Build 70.16]

[# 672748]

NetScaler Insight Center

The SNMP daemon runs on NetScaler Insight Center even though NetScaler Insight Center does not support SNMP requests.

[From Build 63.16]

[# 537253]

The network panel in the XenDesktop Director GUI does not display a graph with the session details when you select another user.

[From Build 65.35]

[# 550209]

The network panel in the XenDesktop Director GUI does not display a graph with the session details for the selected user.

[From Build 65.35]

[# 550227]

Media Classification Support for Insight Center

Web Insight supports content and media type classification reports. Viewing these features are optional similar to the existing HTTP header fields User Agents, Operating Systems, Request Methods etc. You can enable or disable these features from the Configuration section. For media classification and httpContentType Appflow parameter, you must first enable Appflow on virtual server from Insight center configuration.

If, when defining an application in the CloudBridge application classifier, you include a colon (:) in the name, the application's data is not exported correctly to the AppFlow collector.

[From Build 66.11]

[# 561139]

The NetScaler Insight Center appliance throws an error when modifying the name of a threshold record. To fix this issue, the name field has been made read-only.

[From Build 62.10]

[# 573550]

If you use the refresh button, it does not have any effect on the slider. Refresh operation does not have any affect on the time shown in the slider. Also, when you change tabs, it does not impact the slider. You can change the time by changing the time duration.

[From Build 65.35]

[# 576469]

If there are more than 25 records to display in the skip flow window, then only 25 records are displayed as the window does not provide support for pagination.

[From Build 62.10]

[# 576471]

The NetScaler Insight Center appliance might fail and not respond, when you add, update, or delete the private IP address block that is used for geo location.

[From Build 62.10]

[# 576477, 581927]

An exported report displays the time duration as "custom" irrespective of the time duration selected in the report.

[From Build 62.10]

[# 577426]

The NTP server configuration on NetScaler Insight Center is not propagated to the connector, agent, and database nodes.

[From Build 63.16]

[# 579777]

The NetScaler appliance might become unresponsive if Appflow reporting is enabled for ICA traffic and network disruptions occur while the ICA connections are being processed.

The size of the graphs displayed by NetScaler Insight Center is not consistent.

[From Build 67.12]

[# 583382]

If you enable the Appflow feature, the NetScaler appliance might become unresponsive while processing ICA connections.

[From Build 63.16]

[# 584795]

The NetScaler appliance might become unresponsive if you attempt to delete an AppFlow action while the traffic is flowing.

[From Build 65.35]

[# 585914, 613238]

If you enable Appflow for ICA and there are a large number of ICA connections which have reconnected after a network disruption, the NetScaler appliance will experience a memory leak.

[From Build 63.16]

[# 587725]

Poor performance or latency is observed while accessing published applications over plain ICA port 1494 when AppFlow is enabled. This issue is not observed on ICA over CGP port 2598.

[From Build 63.16]

[# 591437, 586981, 591338, 591696]

In the network panel in the XenDesktop Director GUI, the time slider for selecting the time period for a graph is not properly displayed.

[From Build 65.35]

[# 593699]

The network panel in the XenDesktop Director GUI displays the details of all of the administrative user's sessions, instead of just the details for the selected session.

[From Build 65.35]

[# 594512]

When Appflow for ICA is enabled, NeScaler can fail if the client reconnects with an invalid ticket and server responds with a CGP BINDRESP followed by some extra data.

[From Build 64.34]

[# 596784, 596953]

When you configure authentication (Configuration > System > Authentication > Authentication Configuration), the Server Name field does not display the selected server.

[From Build 64.34]

[# 599322]

If a failover occurs in a high availability configuration, an ICA connection that uses Automatic Client Reconnect (ACR) might fail to reconnect.

[From Build 64.34]

[# 601318, 603208]

If the AppFlow feature is enabled for ICA applications, the NetScaler appliance might become unresponsive when Citrix Receiver performs a session reconnect with a ticket that starts with "NS" and the next two bytes have unrecognizable values.

The network panel in the XenDesktop Director GUI displays session details of all users, instead of for just the selected user.

[From Build 65.35]

[# 607332]

If the two NetScaler appliances in a double hop deployment are running different NetScaler software editions (Platinum, Enterprise, or Standard), NetScaler Insight Center fails to generate reports for these appliances on the NetScaler Insight Center dashboard.

[From Build 65.35]

[# 609452]

Adding a private IP block in NetScaler Insight Center fails if you select a country name that has special characters.

[From Build 65.35]

[# 609646, 620408]

NetScaler Insight Center does not cache reports after you enable database caching.

[From Build 65.35]

[# 611269]

For some elements on the dashboard, NetScaler Insight Center does not fetch records for the specified time frame.

[From Build 65.35]

[# 611532, 612283]

The NetScaler appliance might become unresponsive if Appflow reporting is enabled for ICA traffic on the appliance and the XenApp or XenDesktop server is configured to do advanced encryption.

[From Build 67.12]

[# 613306, 622536]

NetScaler Insight Center fails to generate the technical support file, because the namedpipe file causes an error in the creation of the technical support file.

[From Build 65.35]

[# 613622]

The whitelist of Citrix Receiver versions used by HDX Insight now includes version 13.0.3.265571 of Citrix Receiver for Linux.

[From Build 65.35]

[# 614558, 606817]

After you update the country/region/city information for the IP Block, Geo report displays the existing information.

[From Build 69.123]

[# 617352]

If Appflow for ICA is enabled on a NetScaler appliance, some types of ICA traffic fragmentation might cause the appliance to become unresponsive during the initial ICA capability negotiation between client and server.

[From Build 68.11]

[# 617852, 623118, 637416, 644912, 646516, 650520, 652891]

If Appflow for ICA is enabled on a NetScaler appliance, some types of ICA traffic fragmentation might cause the appliance to become unresponsive during the initial ICA capability negotiation between client and server.

[From Build 68.10]

[# 617852, 623118, 637416, 644912, 646516, 650520, 652891]

If you click on a country in the Geo Maps in the XenDesktop Director GUI, the GEO maps are not displayed.

[From Build 65.35]

[# 617872]

NetScaler Insight Center might intermittently become unresponsive and not populate any reports.

[From Build 65.35]

[# 618370, 622539]

The NetScaler appliance might become unresponsive if Appflow reporting is enabled for ICA traffic on the NetScaler appliance.

If Appflow for ICA is enabled on a NetScaler appliance, the appliance might become unresponsive under certain network traffic conditions if ICA expansion is enabled.

[From Build 68.11]

[# 631209, 651260, 652518]

If Appflow for ICA is enabled on a NetScaler appliance, the appliance might become unresponsive under certain network traffic conditions if ICA expansion is enabled.

[From Build 68.10]

[# 631209, 651260, 652518]

NetScaler Insight Center is now supported on KVM hypervisors.

[From Build 65.35]

[# 631295]

In HDX-Insight, the location of public IP addresses is not displayed on the geo map.

[From Build 66.11]

[# 631633]

If Netscaler gateway in configured with two factor authentication, gateway insight is enabled and LDAP authentication as secondary, then a user logins with expired password might fail while changing the password.

[From Build 67.12]

[# 634906, 637383, 638170, 641156, 642427, 644269]

Now, you can enable or disable SLA Traffic reports from NetScaler Insight Center.

To perform this action, navigate to Configuration > System > system Settings > Configure Data Record Settings, and select the Enable SLA Data Collection check box.

[From Build 67.12]

[# 639810]

If you are concurrently using supported and unsupported versions of Citrix Receivers, the NetScaler Insight Center might become unresponsive.

[From Build 67.12]

[# 641992]

If you enable AppFlow on Load Balancing virtual servers of TCP type, the NetScaler Insight center might become unresponsive.

[From Build 67.12]

[# 645281, 645291]

Automatic client reconnection (ACR) for Linux VDA clients fails if NetScaler is in the path and ICA Appflow is enabled for NetScaler.

[From Build 68.11]

[# 648254]

If Appflow for ICA is enabled on a NetScaler appliance, the appliance might become unresponsive under certain circumstances during ICA capability negotiation in ICA PROXY mode.

Geo location does not resolve IP addresses from maxmind data base file GeoCity.dat for both Web and HDX Insight.

[From Build 69.123]

[# 660424, 659826]

The NetScaler appliance fails because it attempts to process a large unexpected value for an Expander variable. This fix adds checks to prevent this condition.

[From Build 69.123]

[# 660894, 662489, 668651]

NetScaler SDX Appliance

On an SDX appliance, if a NetScaler instance is provisioned with more than 3.5 GB memory,

the state of the interfaces might continuously change between UP and DOWN (flap) when the instance processes traffic.

[From Build 65.35]

[# 541222, 548301, 626380]

Citrix User Experience Improvement Program (CUXIP) collects data for the sole purpose of improving the graphical user interface. The collected data is used only by Citrix engineers. It is not shared with anyone.

CUXIP collects the following types of data:

1. Number of clicks by a user

2. Information about the client browser and operating system

For more information, see http://www.citrix.com/community/ux-improvement-program.html

[From Build 63.16]

[# 542084]

If a 10G interface is a part of the LACP channel, it might incorrectly report stalling of transmission (Tx) on VPX.

[From Build 62.10]

[# 564451, 564743]

After interface reset from management service, L2 mode will stop working for the 10G interface.

[From Build 62.10]

[# 564871]

You cannot change only the SSLReneg setting from the "Change SSL Settings" option in the configuration utility.

[From Build 62.10]

[# 572485]

If you are running a NetScaler SDX 11.0 beta version and upgrade to NetScaler 11.0, then some components may not be upgraded. This does not cause any malfunction in the running of the system. However, the upgrade is incomplete.

[From Build 62.10]

[# 576100]

You cannot restore any NetScaler instance from a backup file unless you first upload the XVA files for all of the instances that are included in the backup file.

[From Build 63.16]

[# 585161, 584634]

If an nsroot user uses the Management Service to edit the resource attributes of devices, and the resource validation is done from the tenant to which the device belongs, the resource validation fails while validating the CPU cores.

[From Build 65.35]

[# 587187, 587318]

When a user with nsroot or similar privileges modifies a VPX instance that was originally created by a user from admin domain, the modification might fail because of inadequate resources, even though the admin domain has enough resources.

[From Build 65.35]

[# 587318]

Performing SNMP walk using the EMC SMART tool is slow.

[From Build 63.16]

[# 588451]

The management Service does not support provisioning or modifying a NetScaler instance with gateway IP address from a different subnet as that of the NetScaler IP (NSIP) address.

[From Build 64.34]

[# 593158]

Management Service now supports provisioning or modifying a NetScaler instance with gateway IP address from a different subnet as that of the NetScaler IP Address (NSIP).

[From Build 64.34]

[# 600090]

The NetScaler SDX appliance displays the "SubSystem Down: svm_service" error message when the Management Service creates multiple SNMP requests at run time to fetch network configuration information from XenServer and Management Service configuration files.

[From Build 64.34]

[# 605247]

A memory leak in the event subsystem causes all the subsystems in the Management Service virtual instance to go down. As a result, you cannot log onto the SDX appliance through either the GUI or the CLI.

[From Build 65.35]

[# 605690]

The warning message before a factory reset does not say anything about the physical connection to the appliance. With this fix, the warning message includes information about the physical connection.

[From Build 65.35]

[# 606958]

In the SDX GUI, the Management Service virtual instance displays incorrect memory usage information, because it does not consider the inactive memory.

The SDX platform release consists of two separate images, one for SVM and one for the SDX platform. When upgrading to this platform release from an earlier release, upgrade the two images in the order suggested above.

Also, NetScaler VPX instances based on release 11.0 66.11 can be used on SDX 14xxx/25000 series appliances running either 11.0 66.11 or an earlier version of the platform software, such as 10.5 62.x that supports these series of appliances.

Note: NetScaler VPX is not part of SDX platform release, and it can be based on any NetScaler release version / build that supports SDX 14xxx/25xxx series.

[From Build 66.11]

[# 616616, 626463]

You cannot modify any interface parameters if the Interface Auto Negotiation setting is set to the default (OFF).

[From Build 67.12]

[# 635345]

The Management Service displays the following error message when you access the Management Service dashboard:

Cannot read property 'toLowerCase' of undefined

[From Build 67.12]

[# 635764, 636948]

A NetScaler VPX instance on a NetScaler SDX appliance might fail because of kernel memory corruption caused by a problem in the error handling path in the kernel. The issue occurs when a user-space process fails and dumps the core file at a time when the value for "sysctl.kern.corefile" points to a nonexistent directory.

You can stack trace this issue by searching for the following message in the /var/log/messages file:

If you configure a large number of channels or interfaces on a NetScaler SDX appliance, Management Service UI screens that display the system interface list or channels load slowly.

[From Build 70.16]

[# 659110]

On the NetScaler SDX 25000A platform, you cannot create NetScaler VPX instances on the NetScaler SDX appliance after using the clean install option to reset the appliance to a NetScaler SDX 11.1.50.x. image.

[From Build 70.16]

[# 664825]

Upgrading the Management Service to NetScaler SDX release 11.1.50.x fails with the following error message and with error code 10008:

This platform sysid 450088 is not supported

[From Build 70.16]

[# 670131]

NetScaler VPX Appliance

A NetScaler VPX instance that is deployed on the Hyper-V may crash or unexpectedly reboot if it uses three or more virtual interfaces in the VPX instance.

In an ESX environment, a CLAG channel that includes a VMXNET3 interface might continue to send LACPDUs to its partner even when it is in DETACHED state.

[From Build 70.16]

[# 642389]

In an ESX environment, if a CLAG or Node LAG is created with one or more VMXNET3 interfaces on a NetScaler VPX instance, the NetScaler GUI might show the MAC address of the CLAG or Node LAG as 00:00:00:00:00:00.

[From Build 70.16]

[# 642495]

A NetScaler VPX instance might stop responding and dump core memory if you allocate a large disk size for log messages. The higher the rate of log messages, the more quickly the instance runs out of memory and fails.

[From Build 68.10]

[# 646674]

A NetScaler VPX instance might stop responding and dump core memory if you allocate a large disk size for log messages. The higher the rate of log messages, the more quickly the instance runs out of memory and fails.

[From Build 67.12]

[# 646674]

A NetScaler VPX instance might stop responding and dump core memory if you allocate a large disk size for log messages. The higher the rate of log messages, the more quickly the instance runs out of memory and fails.

[From Build 70.16]

[# 646674]

A NetScaler VPX instance might stop responding and dump core memory if you allocate a large disk size for log messages. The higher the rate of log messages, the more quickly the instance runs out of memory and fails.

[From Build 69.123]

[# 646674]

A NetScaler VPX instance might stop responding and dump core memory if you allocate a large disk size for log messages. The higher the rate of log messages, the more quickly the instance runs out of memory and fails.

[From Build 68.11]

[# 646674]

If you deploy NetScaler VPX on Azure in HA mode, the VPN virtual servers on the secondary node are not reachable after a failover. This is because, during a synchronization operation, the NSIP address of the primary node is used to create the virtual server on the secondary node. After a failover, when the secondary node becomes the new primary, the VPN virtual server has the NSIP address of the old primary.

[From Build 68.10]

[# 651670]

If you deploy NetScaler VPX on Azure in HA mode, the VPN virtual servers on the secondary node are not reachable after a failover. This is because, during a synchronization operation, the NSIP address of the primary node is used to create the virtual server on the secondary node. After a failover, when the secondary node becomes the new primary, the VPN virtual server has the NSIP address of the old primary.

[From Build 68.11]

[# 651670]

When a remote tagged IP address is accessed through a NetScaler VPX appliance hosted on Linux KVM, the checksum value in each sent packet is incorrect.

[From Build 70.16]

[# 655067, 668302]

A NetScaler VPX appliance running on a VMware ESX server and configured with a VMXNET3 network interface stops responding and restarts if any traffic is sent to a tagged interface. Also, in the log message, the VLAN ID of the tagged interface is incorrect.

[From Build 70.16]

[# 671581, 676316]

NetScaler VPX on Azure

On a NetScaler instance deployed on Azure, dummy policies, actions, and load balancing virtual server configurations on an instance are lost if you restart the instance.

Networking

An active FTP connection might get reset for no apparent reason, regardless of the state of the random source port.

[From Build 67.12]

[# 507908, 609496, 611357, 615638]

Duplicate address detection might fail for a global IPv6 address.

[From Build 62.10]

[# 560243]

After the clear config operation, reconfiguring a VXLAN entity fails to retrieve the VXLAN SNMP counters.

[From Build 65.35]

[# 572525, 574734, 614924]

An ACL6 rule might not get evaluated if you set the operator option to NEQ (!=) for source and destination IPv6 addresses.

[From Build 62.10]

[# 573516]

High availability (HA) synchronization fails if the NetScaler IP (NSIP) addresses of the nodes in the HA configuration are IPv6 addresses.

[From Build 62.10]

[# 573935]

A clear config operation does not remove VXLANS. The configuration utility and the CLI continue to show the VXLANs, but with incorrect IDs.

[From Build 65.35]

[# 574734]

A PBR6 rule might not get evaluated if you set the operator option to NEQ (!=) for source and destination IPv6 addresses.

[From Build 62.10]

[# 575906]

A NetScaler appliance might consume a high percentage of CPU cycles, because the appliance repeatedly updates the active connections with changes in MAC addresses of servers.

[From Build 64.34]

[# 579099]

You cannot configure INAT46, INAT64, or INAT66 rules by using the configuration utility.

[From Build 63.16]

[# 582682]

The output of the show ACL does not display the correct hits for ICMP packets that match the ACL rules.

[From Build 63.16]

[# 585265]

On a NetScaler appliance with a forwarding session rule configured and connection failover enabled, the appliance might become unresponsive when processing packets that match the forwarding session rule.

[From Build 64.34]

[# 587382, 603629]

In an IPSec tunnel, the NetScaler appliance might remove sessions between client and server before encrypting (IPSec) DNS response packets, resulting in the loss of these DNS packets in the tunnel.

[From Build 64.34]

[# 587718]

The NetScaler appliance might assign the NTP module a port that is used by some other feature module. Therefore, an incoming NTP response can be processed by the feature module. This can result in the failure of the NetScaler appliance.

[From Build 63.16]

[# 588477]

In a high availability configuration, when the connection between primary and secondary goes down and comes up again, the secondary node receives HA INIT request from the primary node and it terminates all BGP connections.

[From Build 63.16]

[# 588509]

In a high availability configuration, when the connection between primary and secondary goes down and comes up again, the secondary node receives HA INIT request from the primary node and it terminates all BGP connections.

[From Build 64.34]

[# 588509]

If a connection matches a RNAT rule, the NetScaler appliance probes for the existence of the destination server before processing the connection based on the RNAT rule. The connection that is used for probing is sometimes left idle on the appliance and a new connection is opened once the client connection is successfully established. This probe connection stays idle for the configured idle timeout (2.5 hours) thus holding up resources on the server.

Now, these probe connections are flushed within a minute if they remain idle.

[From Build 64.34]

[# 588694, 588551]

On a NetScaler appliance with a NetScaler owned IP address configured with a VMAC address on a traffic domain, when a peer device sends an ARP request with unicast MAC for this IP address, the NetScaler appliance responds with the physical MAC address instead of the VMAC address. As a result, the NetScaler appliance drops packets forwarded by the peer device if the packets are destined to the physical MAC address for that IP address.

[From Build 64.34]

[# 588912]

The configuration utility does not display any route monitors configured on the NetScaler appliance.

[From Build 64.34]

[# 589128]

The NetScaler appliance might erroneously forward DHCP broadcast packets to the default router. As a result, the broadcast packets go in loops between the appliance and the router.

[From Build 64.34]

[# 591657, 595649]

Binding a redundant interface set (for example, LR/1) to NSVLAN might cause the NetScaler appliance to become unresponsive.

[From Build 64.34]

[# 597071]

For extended ACL rules that are associated in NAT configurations (for example, RNAT rules, Large Scale NAT configurations), the configuration utility displays the TCP established parameter as enabled for these ACL rules.

[From Build 64.34]

[# 597458]

For extended ACL rules that are associated in NAT configurations (for example, RNAT rules, Large Scale NAT configurations), the configuration utility displays the TCP established parameter as enabled for these ACL rules.

[From Build 65.35]

[# 597458]

For extended ACL rules that are associated with NAT configurations (for example, RNAT rules and Large Scale NAT configurations), the NetScaler GUI displays the TCP established parameter as enabled even though the parameter is disabled.

[From Build 69.123]

[# 597458]

On a NetScaler appliance, connections might get reset between routing processes. As a result, the dynamic routes are occasionally deleted and added back.

[From Build 65.35]

[# 599306]

Forwarding sessions do no work as expected with bridge groups, because packets are not forwarded to the correct VLAN.

[From Build 65.35]

[# 600012]

You cannot securely access (HTTPS) the NetScaler GUI by using a subnet IP (SNIP) address that is configured on a traffic domain.

[From Build 64.34]

[# 600364]

For a sessionless virtual server configuration, the NetScaler appliance might forward packets for an incoming connection without changing their source MAC address with the MAC address of one of its interfaces. As a result, the connection fails.

[From Build 65.35]

[# 603477, 583499]

In a high availability (HA) setup, high latency might occur during configuration synchronization, resulting in some configurations not getting synchronized to the secondary node. In this situation, an HA failover results in loss of configuration.

[From Build 68.10]

[# 607929]

In a high availability (HA) setup, high latency might occur during configuration synchronization, resulting in some configurations not getting synchronized to the secondary node. In this situation, an HA failover results in loss of configuration.

[From Build 68.11]

[# 607929]

If an IPv6 virtual server with persistency enabled is removed from a traffic domain, the traffic domain information for the existing persistency sessions is lost, and the NetScaler appliance hosting the virtual server becomes unresponsive.

[From Build 65.35]

[# 608558]

The NetScaler appliance fails when it processes invalid UDP packets received at port 500 or port 4500.

[From Build 65.35]

[# 609537, 489498]

A customer using the NetScaler Gateway wizard to configure Storefront through "XenApp and Xen Desktop" might get Invalid Argument error messages.

[From Build 65.35]

[# 611703]

In a GSLB deployment of NetScaler appliances configured with OSPF routing protocol, the OSPF process running in one of the NetScaler appliances sources OSPF hello packets from the GSLB site IP address configured on the appliance. As a result, neighbour adjacency does not get established.

[From Build 65.35]

[# 612419]

For backend TCP connections, a NetScaler appliance might allocate the subnet IP address and port of an active connection to a new connection. As a result, the new TCP connection fails.

[From Build 65.35]

[# 613454]

When you remove an admin partition, the NetScaler appliance fails or corrupts an SNMPD packet queue.

[From Build 65.35]

[# 613457, 614545, 617179, 621236]

The NetScaler appliance does not retain the entire 64 bit ID of IPv6 fragments of a session. As a result, the session might fail.

[From Build 66.11]

[# 614042]

In an active-active deployment using VRRP, a NetScaler appliance does not match its configured bridge ACL rules to the packets received from the inactive VIP addresses of the other NetScaler appliances.

[From Build 66.11]

[# 614786]

The NetScaler appliance might fail if secure management access (HTTPS) is enabled on a SNIP6 address that is configured for a traffic domain.

[From Build 66.11]

[# 618633]

The dynamic routing module on a NetScaler appliance might incorrectly save the command "redistribute intranet" as "redistribute trill" in the ZebOS configuration file. Because the appliance does not support the "redistribute trill" command, after a failover in a high availability setup, the new primary node treats the "redistribute trill" command as an error and does not apply the subsequent commands in the ZebOS configuration file. This results in loss of configuration.

[From Build 65.35]

[# 620152]

The NetScaler appliance sends GARP request for a non-addressable virtual server when the virtual server's state changes to UP or DOWN.

[From Build 66.11]

[# 620697]

In a high availability setup, the monitoring process (pitboss) might terminate the file sync daemon (nsfsyncd), if syncing of files takes longer time (> 25 minutes) than expected.

[From Build 70.16]

[# 624522, 655088, 655708]

When all ports of all IP addresses bound to a netprofile are used in different backend connections, the NetScaler appliance uses one of the SNIP addresses, which is not bound to the netprofile, for a new backend connection. Backend systems reject the connection if the SNIP address is listed in their deny ACL rules. Now, the NetScaler appliance does not initiate any new backend connection when all the ports of all IP addresses in a netprofile are being used.

[From Build 67.12]

[# 627547]

In a high availability setup, the monitoring process (pitboss) might terminate the file sync daemon (nsfsyncd), if the connection to packet engine gets stuck for a long time (> 25 minutes).

[From Build 70.16]

[# 628439]

In a dual-stack lite deployment, the NetScaler appliance does not fragment the received packets if they are too large and the DF bit is not set on them.

[From Build 67.12]

[# 631894]

FTP in passive mode does not work in this build.

[From Build 65.35]

[# 631929]

The existing static ARP entries might point to incorrect MAC addresses after you perform any bind or unbind, or remove VLAN operation.

[From Build 67.12]

[# 635823]

The NetScaler appliance might become unresponsive when one or both of the following conditions are met:

- When you remove a traffic domain, which has ACLs, or ACL6s, or PBRs, or PBR6s rules, without performing apply operation for ACLs, or ACL6s, or PBRs, or PBR6s rules.

- When you remove any ACL, or ACL6, or PBR, or PBR6 rule within a traffic domain and then remove the traffic domain before performing apply operation for ACLs, or ACL6s, or PBRs, or PBR6s rules.

[From Build 67.12]

[# 636269]

SNMP access to the NSIP address of a NetScaler appliance does not work through a CloudBridge Connector tunnel.

[From Build 68.11]

[# 637018]

SNMP access to the NSIP address of a NetScaler appliance does not work through a CloudBridge Connector tunnel.

[From Build 68.10]

[# 637018]

The NetScaler sends ARP requests for NSIP address on all the interfaces instead of only on the interfaces bound to the NSVLAN.

[From Build 67.12]

[# 639356]

In a high availability setup, secondary node advertises default routes even after performing "ns block-sec-rtadv" operation in VTYSH shell.

[From Build 67.12]

[# 639541]

The NetScaler appliance does not return the value of SNMP OID "lldpRemPortId" for SNMP walk requests.

[From Build 67.12]

[# 639630]

For SIP and RTSP Application Layer Gateways (ALGs) to work properly for a large Scale NAT (LSN) configuration on a NetScaler appliance, it is mandatory to configure all ports of the NAT IP address for FULL cone NAT. That is, Endpoint-Independent Mapping (EIM) and Endpoint Independent Filtering (EIF) must be enabled on these ports, even though they are not used by SIP and RTSP traffic.

[From Build 68.11]

[# 641719]

For SIP and RTSP Application Layer Gateways (ALGs) to work properly for a large Scale NAT (LSN) configuration on a NetScaler appliance, it is mandatory to configure all ports of the NAT IP address for FULL cone NAT. That is, Endpoint-Independent Mapping (EIM) and Endpoint Independent Filtering (EIF) must be enabled on these ports, even though they are not used by SIP and RTSP traffic.

[From Build 68.10]

[# 641719]

During a "force sync" operation in a cluster deployment, performing a "save config" operation on a node might lead to a full or partial configuration loss on that node. With this fix, the "save config" operation is not permitted during a "force sync" operation.

[From Build 68.10]

[# 642375]

During a "force sync" operation in a cluster deployment, performing a "save config" operation on a node might lead to a full or partial configuration loss on that node. With this fix, the "save config" operation is not permitted during a "force sync" operation.

[From Build 68.11]

[# 642375, 658619]

In a high availability (HA) setup, after an HA force failover operation, the NetScaler appliance removes (but not properly) static default route6s of all non-default traffic domains from its memory.

Though the "show route6 operation" does not display these route6s but adding them again fails with the following error message: "ERROR: Resource already exists." This is because these route6s were not completely removed from memory.

This issue also happens on a standalone NetScaler appliance when a traffic domain that has default route6s is removed.

[From Build 69.123]

[# 644265]

A NetScaler appliance with OSPFv3 dynamic routing protocol configured might measure the length of OSPFv3 LSA packets in Network Byte Order instead of Host Byte Order for comparison with the minimum required packet length. As a result, the NetScaler appliance becomes unresponsive.

[From Build 68.10]

[# 652131]

A NetScaler appliance with OSPFv3 dynamic routing protocol configured might measure the length of OSPFv3 LSA packets in Network Byte Order instead of Host Byte Order for comparison with the minimum required packet length. As a result, the NetScaler appliance becomes unresponsive.

[From Build 68.11]

[# 652131]

On a NetScaler appliance, when a routing daemon (for example, BGP routing daemon) is restarted multiple times over a short period of time, the corresponding routing configuration (for example, BGP routing configuration) might get removed from the appliance.

[From Build 70.16]

[# 669005]

In a high availability setup, when a critical interface goes to DOWN state because of TX stall, HA failover might not happen.

[From Build 71.24]

[# 677815, 679068, 680001]

A NetScaler appliance logs an IP conflict error when it receives any unsolicited ARP message from a network device such as Check Point Firewall for a NetScaler appliance-owned IP address. The appliance logs an IP address conflict error even if the IP address to MAC address mapping is correct in the ARP message.

[From Build 71.24]

[# 679490, 689372]

Memory allocated for a TCP session might not get free after a failure in reassembling fragments of a size of more than 1500 bytes. This accumulation over a period of time depletes available memory.

[From Build 71.24]

[# 680185, 680186]

Interfaces in MUTED state might drop the LLDP packets instead of processing them.

[From Build 71.24]

[# 682769]

The NetScaler appliance drops ND6 solicitation packets received on interfaces that are in muted state.

[From Build 71.24]

[# 684119]

The NetScaler appliance does not process the BGP remote-as configuration for an IPv6 peer after a reboot resulting in the loss of BGP configuration for this peer.

[From Build 71.24]

[# 685123]

When you remove a static route, the NetScaler appliance does not advertise the connected route that has the same prefix as that of the removed static route and for which the DRADV mode is enabled.

[From Build 71.24]

[# 686058]

If the IP address (type VIP) of a virtual server is bound to a net profile, deleting the virtual server also removes the IP address from the net profile.

[From Build 71.24]

[# 690082]

Optimization

Enabling the media classification feature causes the NetScaler appliance to become unresponsive.

A NetScaler appliance crashes when Media classification mode is enabled and HTTP request of bigger URLs are received.

[From Build 64.34]

[# 589825, 594694, 606589, 607919]

If a response from the StoreFront server does not have a Content Type field in the header, but the appliance expects a value in the Content Type field, the appliance crashes.

[From Build 71.24]

[# 688412]

Platform

The memory usage statistic shown on the LCD display of a NetScaler appliance is the allocated memory. The NetScaler configuration utility displays the currently used memory. Therefore, the two values are different.

[From Build 63.16]

[# 334358, 576545]

This release supports the MPX 25100T and MPX 25160T platforms. For more information about these platforms, see http://docs.citrix.com/en-us/netscaler/10-1/ns-gen-hardware-wrapper-10-con/ns-hardware-platforms-con/ns-hardware-25100T-25160T-ref.html.

[From Build 68.10]

[# 486703, 495591, 552218]

This release supports the MPX 25100T and MPX 25160T platforms. For more information about these platforms, see http://docs.citrix.com/en-us/netscaler/10-1/ns-gen-hardware-wrapper-10-con/ns-hardware-platforms-con/ns-hardware-25100T-25160T-ref.html.

[From Build 68.11]

[# 486703, 495591, 552218]

OpenSSL libraries are now integrated to operate in the FIPS mode.

[From Build 64.34]

[# 523834]

The LOM firmware on NetScaler MPX 11500/13500/14500/16500/18500/20500 and MPX 11515/11520/11530/11540/11542 appliances can report VTT sensor data, but the NetScaler appliance does not support it.

[From Build 64.34]

[# 563987, 572404]

NetScaler VPX instances, running on SDX 22040/22060/22080/22100/22120 and SDX 24100/24150 appliances, fail to start after you upgrade to the NetScaler SDX release 11 single bundle image. Starting the NetScaler instances manually also fails.

[From Build 62.10]

[# 569291]

The RAID controller is frequently reset. With this fix the, RAID controller's driver has been modified and the firmware upgraded to version 23.33.0-0023. The frequent resets no longer occur.

[From Build 65.35]

[# 577075, 521790]

Support for New Hardware Platforms

The T1120 and T1300-40G platforms with NIC firmware 4.53 are now supported in this release.

NetScaler SDX provides the latest XL710 v5.04 firmware for the following platforms:

* SDX Model: 14xxx 40G

* SDX Model: 25xxx 40G

The XL710 v5.04 firmware includes a tool to automatically upgrade the XL710 firmware from the previous version to v5.04.

For more information, see https://support.citrix.com/article/CTX218219.

[From Build 69.123]

[# 620786]

In rare cases, a user-mode process failure can cause kernel failure, either at the same time or later. If the kernel fails, the NetScaler appliance dumps core memory. This failure can occur on nCore MPX, VPX, or SDX, appliances, although the most common occurrence is on a NetScaler VPX instance on a NetScaler SDX appliance.

[From Build 69.123]

[# 634900, 641199]

Policies

An HTTP callout that is configured for use with a virtual server does not work with a backup virtual server (if configured).

[From Build 64.34]

[# 382341, 540646, 585790]

Some IP based expressions might not work for IP addresses starting from octet 128 or greater (128.x.x.x - 254.x.x.x).

While evaluating default syntax expression for local time zone, a NetScaler appliance incorrectly applies US daylight savings time (DST) rules in non-US timezone. This results in setting an offset time for an hour. For example, the default expression !(SYS.TIME.GE (LOCAL 8h) & SYS.TIME.LE(LOCAL 17h)) returns 'False' if the local time in US timezone is between 0800 and 1700. In the UK timezone, this expression incorrectly returns 'False' if the local time is between 0700 and 0759 and returns 'True' if the local time is between 1700 and 1759 from 8 Mar 2015 (the start of US DST) to 28 Mar 2015 (the day before the start of UK DST) and also from 25 Oct 2015 (the day after the end of UK DST) to 31 Oct (the day before the end of US DST).

[From Build 68.11]

[# 556230]

While evaluating default syntax expression for local time zone, a NetScaler appliance incorrectly applies US daylight savings time (DST) rules in non-US timezone. This results in setting an offset time for an hour. For example, the default expression !(SYS.TIME.GE (LOCAL 8h) & SYS.TIME.LE(LOCAL 17h)) returns 'False' if the local time in US timezone is between 0800 and 1700. In the UK timezone, this expression incorrectly returns 'False' if the local time is between 0700 and 0759 and returns 'True' if the local time is between 1700 and 1759 from 8 Mar 2015 (the start of US DST) to 28 Mar 2015 (the day before the start of UK DST) and also from 25 Oct 2015 (the day after the end of UK DST) to 31 Oct (the day before the end of US DST).

[From Build 68.10]

[# 556230]

The NetScaler appliance fails to respond when a blocking log action is configured with a responder action.

[From Build 62.10]

[# 574458, 574593]

The default timeouts for Rewrite Processing and for Advanced Expression Regex Evaluation have changed from 1 millisecond to less than the pitboss timeout of 5 seconds. This restores the default behavior for releases prior to 11.0. In addition, an optional -timeout parameter to "set the re-write param " CLI command was added. The time is measured in milliseconds - see the man page. A "set policy param -timeout &lt;value>" command has been added to the CLI. These ways of setting the timeout work for all partitions.

In release 11.0, the default timeouts for Rewrite Processing and for Advanced Expression Regex Evaluation have also changed from 1 millisecond to less than the pitboss timeout. This restores the default behavior from releases prior to 11.0. However, neither the CLI command, nor the GUI, nor the Nitro call is available. Instead, for 11.0, an nsapimgr command is available from the shell. This will only change the timeout on the default partition when Partitioning is used. Other partitions will only use the default. The syntax is as follows: "nsapimgr_wr.sh -ys arg1=&lt;value> -ys call=ns_pixl_regex_set_time_limit" to set the time limit on regular expression evaluation in Advanced expressions. "nsapimgr_wr.sh -ys arg1=&lt;value> -ys call=ns_rw_set_eval_time_limit" to set the time limit on Rewrite processing. For either of these, setting the value to 0 resets the limit to the default. These nsapimgr commands will not be supported after 11.0, and the CLI, GUI, or Nitro must be used.

If packet tracing is configured with a default-syntax expression and non-TCP traffic is being processed, and rewrite action applied on a HTTP chunked message is occurring then the rewritten data maybe incorrect or it might crash a NetScaler appliance.

[From Build 64.34]

[# 598465]

Under certain conditions, a NetScaler appliance does not insert an X-Forwarded-For field in the HTTP header for HTTP CONNECT requests that are forwarded to server.

[From Build 65.35]

[# 605089]

Rewrite action block leading to subsequent action time outs.

If multiple rewrite policies evaluate to TRUE for a particular protocol and direction (for example HTTP request or TCP response), and more than one associated action is selected for execution, they might not all execute. If one of the actions is suspended (blocked), the next selected action will time out, and any subsequent actions will be skipped.

The following functions in expressions can block:

* HTTP_CALLOUT

* MATCHES_LOCATION

* STREAM

* CHECK_LIMIT

* MATCHES

* BODY

* PAYLOAD

* MSSQL

* MYSQL

* ORACLE

* SUBSCRIBER

* DETERMINE_SERVICES

* use of variables (in other words, $<variableName>)

Note: These expressions can block, depending on specific conditions that occur at the time of execution.

[From Build 65.35]

[# 628326]

A NetScaler appliance fails if you perform a Clear Configuration operation.

[From Build 67.12]

[# 634124]

In a NetScaler appliance if the set memory limit is insufficient to support the configured number of VPN sessions, the appliance fails.

[From Build 67.12]

[# 636579]

The audit framework has no mechanism to filter UndefHit logs generated in ns.log for undefined hits on rewrite or responder policies. To turn off log generation, you must remove HTTP transaction logging for undefined policies.

[From Build 71.24]

[# 690748]

Responder

The NetScaler appliance fails if it receives a new request while an embedded expression in the responder HTML page is in blocking state.

[From Build 65.35]

[# 556035]

SSL

The version displayed in syslog is SSLv2.0 even though the session is negotiated using TLSv1.2.

[From Build 69.123]

[# 474417, 474413]

If you downgrade the software on your NetScaler appliance that does not have a license to release 9.3 build 61.66 or earlier, some commands related to the default server certificate might not be saved in the running configuration. As a result, after restarting, secure access (HTTPS) to the appliance fails.

[From Build 63.16]

[# 551603, 559154]

If you update the certificate-key pair for a service group, the change is not reflected in the individual services that are bound to this service group. As a result, the old certificate-key pair continues to be used for negotiation in the SSL handshake.

[From Build 63.16]

[# 554925]

Even though SSL renegotiation is set to deny (that is, denySSLReneg is set to ALL), the server responds with the "server reneg" extension in the initial SSL handshake.

[From Build 64.34]

[# 559082]

In some cases, when client authentication is enabled, incorrect data form a client leads to a memory leak on the NetScaler appliance. If a large number of clients send incorrect data, the appliance fails.

[From Build 63.16]

[# 570754]

The NetScaler appliance displays high CPU usage because of a wrong computation of idle time.

[From Build 70.16]

[# 571226, 652915]

If you restart a NetScaler appliance that has FIPS firmware version 2.2, the FIPS key might be temporarily unavailable.

[From Build 64.34]

[# 572645, 563418, 576719, 594569, 603072]

An incoming SSL record that spans more than 256 TCP packets and contains TCP header options causes memory corruption in the Cavium command buffer structure. As a result, the NetScaler appliance fails.

[From Build 63.16]

[# 573904, 583295, 590222]

You cannot enable TLSv1.1/1.2 on a front end SSL service after explicitly disabling it.

[From Build 62.10]

[# 574589]

On a NetScaler MPX appliance, AES-GCM/SHA2 ciphers are supported only on the front end SSL entities.

[From Build 62.10]

[# 575001]

On an MPX-FIPS platform running firmware version 2.2, if you have configured SSL services at the back end, an attempt to download a file fails if its size is greater than 16KB.

[From Build 64.34]

[# 578464, 582280]

If you have a large number of SSL services (greater than 3000) in the backend, CPU usage increases exponentially and the appliance fails.

[From Build 63.16]

[# 581193]

In a cluster setup, a certificate update fails, with the following error, if the certificate is in DER format.

Error :: No such resource

[From Build 71.24]

[# 583715]

If you bind a secure monitor to a service, such as SSL_BRIDGE, that does not allow SSL configuration, the default settings are used. The default SSL version sent in the SSL handshake record header is SSLv3.

Contact Citrix support if you want to disable SSLv3 and use the next higher protocol.

[From Build 64.34]

[# 584424]

If you configure a clear text port on an SSL-based wildcard virtual server, and run the clear config command with the extended+ option, the NetScaler appliance fails.

[From Build 67.12]

[# 586199]

If you use the "add ssl certkey" command to add an encrypted .pfx file, the password is now encrypted and saved in the configuration file (ns.conf). In earlier releases, the password was not saved, so automatic execution of the add ssl certkey command failed when the appliance was restarted.

[From Build 63.16]

[# 591167]

If TLS1.1/1.2 protocol is used with AES/3DES ciphers, the length of the TCP window at the back end shrinks to zero. As a result, after some time, the connection is terminated.

If the passphrase for a certificate contains the "$" character, the configuration utility becomes unresponsive.

[From Build 64.34]

[# 591743]

If you have configured optional client-certificate authentication and your policies target client certificate x509 extensions, such as auth keyid, a transaction with a client that doesn't have a certificate might cause the appliance to fail or to use stale values from a previous transaction.

[From Build 64.34]

[# 593091]

If you have configured optional client-certificate authentication and your policies target client certificate x509 extensions, such as auth keyid, a transaction with a client that doesn't have a certificate might cause the appliance to fail or to use stale values from a previous transaction.

[From Build 63.16]

[# 593091]

If you enable the DH parameter while creating an SSL profile by using the configuration utility, the following error message appears:

Error in retrieving File. Invalid args in query parameters

[From Build 64.34]

[# 594922]

In the OpenSSL interface in the NetScaler configuration utility, if you type a command before the OpenSSL> prompt appears, the OpenSSL> prompt might not appear at all. As a result, any commands that you type are not run in OpenSSL mode.

[From Build 64.34]

[# 595413]

An MPX-FIPS appliance might not restart if you attempt a warm reboot.

[From Build 64.34]

[# 597101]

If you upgrade the FIPS firmware on your appliance to version 2.2 and then restart it, you might notice some loss in the configuration.

[From Build 64.34]

[# 597313]

If you are running FIPS firmware 2.2 on your appliance, some commands might fail after 9 days.

[From Build 64.34]

[# 600267]

If you upgrade to release 10.5, SSL client authentication fails if it uses a 4096-bit client certificate.

[From Build 70.16]

[# 600815, 343395]

SSL internal services might fail if you modify any SSL parameters while the SSL feature is disabled or not licensed.

[From Build 67.12]

[# 601951]

In release 10.5 or later, TLS protocol versions 1.1 and 1.2 are enabled by default, but you can disable them for all services except SSL_BRIDGE and dynamic services, which can't otherwise be configured. In this release, you can disable TLS1.1/1.2 on SSL_BRIDGE and dynamic services by enabling the new svctls1112disable and montls1112disable parameters, as follows:

> set ssl param -svctls1112disable enable -montls1112disable enable

After the new parameters are enabled, you cannot disable them by using the "set ssl param" command. You must edit the configuration (ns.conf) file as follows:

1. Remove these parameters from the "set ssl param" command.

2. Save the configuration.

3. Restart the appliance.

[From Build 64.34]

[# 602502, 599209, 609284]

You cannot install a certificate on the appliance if the certificate is not in the /nsconfig/ssl directory. With this fix, you can install a certificate in the appliance's default partition from any location. For other partitions, the certificate must be in the /nsconfig/partitions/ssl/ directory.

[From Build 65.35]

[# 602631]

NetScaler VPX virtual appliances do not support AES-GCM/SHA2 ciphers, but in earlier builds you can bind these ciphers, incorrectly, to an SSL virtual server. From the current build, you cannot bind these ciphers to the virtual server. If you have bound AES-GCM/SHA2 ciphers to a VPX instance that you upgrade to the current build, the bind commands in the configuration return an error. In a comparison of the configurations of the old and new build, the missing bindings can be mistakenly construed as a configuration loss.

[From Build 64.34]

[# 609476]

When clearing the NetScaler configuration, user-defined cipher groups that are bound to an internal SSL service might get corrupted. Subsequent cipher bind or unbind operations with that service will cause the appliance to become unresponsive.

[From Build 65.35]

[# 611894, 622042]

The appliance fails if a loop is created while linking the certificates. With this fix, the software checks whether a new certificate is already part of the link.

[From Build 67.12]

[# 612461]

A configuration loss, such as the ECC curve and ciphers unbinding from an SSL virtual server or service, might occur after you upgrade to this build.

[From Build 71.24]

[# 613912, 643135, 647100, 692451]

A DTLS configuration fails if it uses MAC-Based forwarding or a VLAN.

[From Build 69.123]

[# 615454, 629512]

In a cluster setup, if you rename a load balancing virtual server of type SSL, the local database table that is used for all GET operations is not updated.

[From Build 69.123]

[# 620964, 576828, 641041]

If you have configured a DTLS virtual server and also enabled the Default profile, clearing the configuration might cause the appliance to fail.

Note: On some STA services, if you enable DTLS, you don't have to explicitly create a DTLS virtual server, because it is automatically created. The automatically created DTLS server does not cause the configuration to fail if the Default profile is enabled.

[From Build 67.12]

[# 622916, 625989, 632989, 634897, 639567]

The NetScaler appliance fails if it parses the value of an unknown certificate extension while the certificate is loading.

[From Build 65.35]

[# 623996]

After you upgrade to this build, configuring a front-end service, or creating an internal service, with default ciphers results in a cipher inconsistency between a packet engine and the cluster configDB.

[From Build 66.11]

[# 625966]

The output of the "stat ssl -detail" command is different for back-end entities than for front-end entities. The output for back-end entities does not include statistics for sessions, handshakes, or client authentications for TLS protocol versions 1.1 and version 1.2.

At the back end, the label "Authorizations" is incorrect. It should be "Authentications."

[From Build 68.10]

[# 627635]

The output of the "stat ssl -detail" command is different for back-end entities than for front-end entities. The output for back-end entities does not include statistics for sessions, handshakes, or client authentications for TLS protocol versions 1.1 and version 1.2.

At the back end, the label "Authorizations" is incorrect. It should be "Authentications."

[From Build 68.11]

[# 627635]

The output of the "stat ssl -detail" command is different for back-end entities than for front-end entities. The output for back-end entities does not include statistics for sessions, handshakes, or client authentications for TLS protocol versions 1.1 and version 1.2.

At the back end, the label "Authorizations" is incorrect. It should be "Authentications."

[From Build 67.12]

[# 627635]

The output of the "stat ssl vserver" command includes the statistics for non-SSL virtual servers.

[From Build 70.16]

[# 627650]

If a profile is bound to an SSL virtual server, the NITRO API displays incorrect SSL virtual server settings. The correct settings are displayed in the profile.

[From Build 69.123]

[# 628135]

In a cluster setup, an error message appears if you run any of the following commands:

show ssl vserver [<vServerName>] [-cipherDetails]

show ssl service [<serviceName>] [-cipherDetails]

show ssl serviceGroup [<serviceGroupName>] [-cipherDetails]

[From Build 67.12]

[# 628296]

If memory allocation fails during a TLS1.2 protocol handshake, the handshake is not terminated. As a result, the appliance might dump memory core and restart.

In a cluster setup, if you have configured a front end service, or an internal service is created, with default ciphers, and then you upgrade to this build, there is a cipher inconsistency between a packet engine and the cluster configDB.

[From Build 67.12]

[# 631258]

In a cluster setup, if you try to update an existing certificate by replacing the old files with new certificate and key files, the following error message appears:

ERROR: Resource already exists [certkeyName Contents, nglab-2016]

[From Build 67.12]

[# 633395]

In a cluster setup, the serial number and validity do not appear correctly in the output of the "sh ssl certkey" command.

[From Build 67.12]

[# 635851, 504829]

On a NetScaler MPX appliance, an SSL handshake that uses NULL ciphers fails on both the front end and the back end.

[From Build 69.123]

[# 642885, 612482, 644392, 654541, 657541]

If you try to load large certificate files (> 256kB), the NetScaler appliance might dump core and restart, because of insufficient memory.

[From Build 69.123]

[# 643614, 624364, 646510, 667980]

The "stat ssl vserver" command for a content switching, cache redirection, or VPN virtual server fails, and the following error message appears:

No such resource [vServerName, <vservername>]

[From Build 70.16]

[# 644731, 671337]

A NetScaler virtual appliance sometimes fails because of a memory leak if you use GCM-based ciphers on a VPX platform. The ciphers can eventually exhaust memory, causing the appliance to fail if the memory exhaustion error is not gracefully handled.

[From Build 68.10]

[# 652477, 654559, 655657, 656035, 657343]

A NetScaler virtual appliance sometimes fails because of a memory leak if you use GCM-based ciphers on a VPX platform. The ciphers can eventually exhaust memory, causing the appliance to fail if the memory exhaustion error is not gracefully handled.

[From Build 68.11]

[# 652477, 654559, 656035, 657343]

For each SSL record that a NetScaler appliance receives from a server, the appliance opens a TCP window corresponding to the SSL layer's overhead. However, if SHA256 ciphers are used, the MAC size is incorrectly calculated as 20 bytes instead of 32 bytes. As a result, the advertised window shrinks by 12 bytes and, for a large file transfer, a TCP zero window is advertised and further transactions are dropped.

[From Build 69.123]

[# 656605, 653145, 657155, 658451, 658645, 658996, 659804, 659945]

The NetScaler appliance might dump core memory and restart if you bind a secure monitor to a domain based service.

[From Build 70.16]

[# 661808, 662002, 672103, 672532, 674664, 671558, 674758]

The SSL parameter "deny SSL renegotiation" is now set to ALL by default in all admin partitions. Previously, it was set to NO in the non-default partitions.

[From Build 70.16]

[# 663601]

In a cluster setup, you cannot make any change to a service or service group if you have associated a common name with the service or the service group and enabled or disabled server name indication (SNI).

[From Build 70.16]

[# 665340]

An SSL handshake fails if a client hello includes an ECC extension but all the ECDHE ciphers in the cipher list sent by the client are not supported by the NetScaler appliance even though the list contains some non-ECDHE ciphers that are supported.

[From Build 69.123]

[# 668239]

An SSL handshake fails if a client hello includes an ECC extension but the NetScaler appliance does not support any of the ECDHE ciphers in the cipher list sent by the client. The handshake fails even if the list contains some non-ECDHE ciphers that are supported.

[From Build 70.16]

[# 668239]

The service group members do not appear in the output of the "show lb vserver <name>" command if it is run on a cluster IP address.

[From Build 71.24]

[# 668935, 642802, 463835, 684073, 684892, 691890]

The "set ssl vserver" or the "unset ssl vserver" command fails and the following error message appears:

Internal error

[From Build 70.16]

[# 670927, 673889, 673829, 671270]

In a cluster setup, after you run the clear config or force cluster sync command, the ClientAuth option for internal SSL services changes to ServerAuth. If you then try to set ClientAuth on an internal SSL service, the following error message appears:

ERROR: Operation not supported

[From Build 71.24]

[# 672063]

A NetScaler appliance might dump core and restart if you have configured policy based SSL renegotiation and a client sends multiple SSL records before renegotiation is initiated.

[From Build 71.24]

[# 673348, 682192, 682160, 684547, 684992, 687515]

In rare cases, a NetScaler appliance might dump core and restart if you add a certificate revocation list (CRL) larger than 256 KB.

[From Build 71.24]

[# 674278, 678890]

The NetScaler appliance might occasionally send a wrong certificate if SNI is enabled.

[From Build 71.24]

[# 675158, 693118]

An incorrect entry is logged for handshake failure, even though the handshake succeeds, if both of the following conditions are met:

-You use a Safari browser to access the NetScaler appliance.

-OCSP responder is configured and client authentication is enabled on the SSL virtual server.

[From Build 71.24]

[# 676629]

The NetScaler appliance dumps core and restarts if a wildcard SSL virtual server has the -m mac option enabled.

[From Build 71.24]

[# 682775]

Memory leak might occur in OpenSSL functions if the NetScaler appliance is low on memory.

[From Build 71.24]

[# 684055]

The connection with the back-end server is terminated if OCSP validation for the server certificate fails, even though OCSP validation is optional.

[From Build 71.24]

[# 686998]

If you try to add a certificate-key pair containing an unsupported OID in the Subject Alternative Name (SAN) field of the certificate, the following error message appears:

ERROR: Invalid OID for SAN entry in certificate

[From Build 71.24]

[# 688416]

A certificate without a common name field in the subject name fails to load.

[From Build 71.24]

[# 688811]

System

A NetScaler appliance might crash if you attempt to start the nstrace instance with advanced filter expression.

[From Build 64.34]

[# 493737, 526095, 598148]

If you execute NTP commands, such as enable ntp sync and show ntp status, the NetScaler appliance might become unresponsive because of a memory leak.

A high availability pair fails if an HTTP response from a back-end server contains carriage return line feeds (CRLFs) after the HTTP Content Length and at the start of a new packet.

[From Build 66.11]

[# 547267, 623146]

When SPDY Protocol is enabled and SPDY Traffic is received on the NetScaler appliance, the TCP current clients counter goes to negative values and shows a very large value in the stat or the SNMP OID.

[From Build 63.16]

[# 551562, 551786, 568554]

After you upgrade a Netscaler appliance to 10.5 build, the Client-Server Link Mapping check box is now available in the TCP Connections page

[From Build 64.34]

[# 551611, 519966]

After cleaning up an MPTCP session, the NetScaler appliance might not set the DATA_FIN flag in the TCP header of the data or acknowledgement packet if there is no subflow for sending the data.

[From Build 63.16]

[# 553650]

If a client on an IPV6 connection advertises an MSS value below 1360 (bytes), the NetScaler appliance responds with a MSS value below the (RFC) required minimum value of 1220 (bytes).

[From Build 67.12]

[# 556475]

In certain cases, the NetScaler appliance might not retransmit the lost TCP segments resulting in a transaction failure.

[From Build 65.35]

[# 565938, 560394, 592227, 597160, 607864, 609068]

In certain cases, the NetScaler appliance might not retransmit the lost TCP segments resulting in a transaction failure.

[From Build 64.34]

[# 565938, 560394, 592227, 597160, 607864, 609068]

Support restore operation on the NetScaler Appliance by using a remotely stored backup

You can now use a remotely saved backup to restore a NetScaler appliance through the "add system backup <filename>", that adds the metadata to the remote backup package, so that the restore operation can successfully use the backup package.

[From Build 65.35]

[# 569974]

In NetScaler Insight Center, NetScaler 1000V, and NetScaler VPX on ESX, the Vmtoolsd daemon fails during start up and creates a core dump in the directory /var/core. It does not affect normal VPX functionality. However, operations such as "Shut Down Guest" and "Restart Guest" from the vSphere client summary tab fail.

[From Build 63.16]

[# 570166, 477094, 498384, 520519, 530951, 543554, 555689, 585809]

The NetScaler appliance might become unresponsive if it receives a retransmitted TCP jumbo frame that carries the TCP FIN flag.

[From Build 63.16]

[# 571176]

In a high availability setup, if stateful connection failover is configured on a virtual server that has been serving traffic for some time, running the "clear config extended" command results in a warm restart on both the primary and secondary appliances. Unsetting connection failover on the virtual server results is a warm restart on only the secondary appliance.

[From Build 63.16]

[# 575108, 581862]

A NetScaler appliance might occasionally fail when a client connects to an HTTP/SSL server and the server sends a 101 (switching protocols) response. The connection is closed before data can be sent or received from the client.

[From Build 64.34]

[# 576561, 587759]

When NetScaler sends out full sized persist probe packet that is more than the client advertised window, firewall drops the packet causing the connection to fail.

[From Build 68.11]

[# 576980]

When a NetScaler appliance sends out full sized persist probe packet that is more than the client advertised window, firewall drops the packet causing the connection to fail.

[From Build 69.123]

[# 576980]

If a NetScaler appliance that is sending auditlog messages over TCP (audit syslogaction specifies TCP as the transport protocol) has more than 200 million active sessions, the rate at which the syslogs are sent drops to 700 Kbps or lower, and the appliance consumes a high percentage of the CPU cycles.

[From Build 63.16]

[# 580309]

The option to set the transport type has been removed from the SET and UNSET operations. You can specify the transport type while adding a Syslog action. In a Syslog action, by default the transport type is set as UDP.

Note: Once you have set the transport type in a Syslog action, you cannot change the transport type.

[From Build 62.10]

[# 580890]

In a HA setup, if a domain-based SNMP manager is added on the secondary appliance, the NetScaler appliance stops responding eventually. You must configure the SNMP manager on the primary appliance.

[From Build 64.34]

[# 581355, 593292, 595943]

When the NetScaler appliance receives MPTCP traffic, the number of established client connections is high, because both MPTCP sessions and subflows are treated as client connections.

With this fix, the SNMP OID of following MIBs have changed to:

mptcpCurSessWithoutSFs: 130

vsvrCurMptcpSessions: 73

vsvrCursubflowConn: 74

[From Build 64.34]

[# 583292]

Management access to the NetScaler appliance can slow down or become unavailable when the traffic domain identifier is not initialized for jumbo frames. However, virtual servers continue to serve traffic.

[From Build 65.35]

[# 583579, 594722, 626120]

The NetScaler appliance might become unresponsive if front end optimization (FEO) is enabled with the SSL and rewrite features.

[From Build 63.16]

[# 583829]

A NetScaler appliance fails when it receives an MP_CAPABLE final acknowledgement in a single packet with the FIN flag set.

[From Build 65.35]

[# 583853, 583855, 588078, 601746, 602955]

If a server advertises a maximum segment size (MSS) greater than 1460 bytes, a TCP transaction might not generate a response after passing through the NetScaler appliance.

The upgrade wizard in the configuration utility puts the NetScaler software in the /var directory instead of the /var/nsinstall/<build id> directory.

[From Build 63.16]

[# 586721]

On rebooting the NetScaler appliance, the timeout is not set to the value specified by the "set ns timeout" command.

[From Build 63.16]

[# 587074]

If the maximum available memory of a TCP Buffer (TCPB) is unequally divided among Packet Engines (PE) running on a NetScaler appliance, the PE will install the TCPB on a TCP connection without sufficient memory buffer. This leads to a connection reset.

[From Build 69.123]

[# 587114]

The appliance might fail under the following set of conditions:

1. A pipelined HTTP request is received that spans multiple TCP segments.

2. An internal HTTP response generated by NetScaler for the HTTP request in condition 1, is terminated by a TCP segment that has the TCP FIN flag set.

3. The appliance receives another HTTP request on the same connection.

[From Build 64.34]

[# 587817, 587879, 589416, 594044, 595927, 601915, 610728]

When parsing a host name with no Path component, the URL parsing logic does not search for a question mark (?), so an entire string might be interpreted as the host name. This causes an error when the appliance tries to resolve the DNS name. With this fix, the parsing logic searches for question marks.

If the NetScaler appliance receives a data or an acknowledgement packet without the Data Sequence Signal (DSS) option before the MPTCP connection is established, the appliance does not seamlessly fallback to regular TCP.

[From Build 64.34]

[# 588909]

Failed SNMP requests were not removed properly, therefore, subsequent set requests were retained in the queue. This lead to all SNMP requests getting blocked and high memory usage, due to which the SNMP module stops responding.

[From Build 64.34]

[# 590289, 584527, 596242]

In a high availability setup with stateful connection failover option enabled on a virtual sever, if a network link that is used for synchronizing connection information between the nodes becomes DOWN.

Both nodes take a lot a time to reestablish connection information synchronization through the remaining active links, as a result some connection information might not get synchronize to the secondary node.

[From Build 65.35]

[# 590574]

A NetScaler appliance has high memory consumption if Front End Optimization (FEO) feature is enabled.

Work around: Disable the feature or reboot the appliance.

[From Build 64.34]

[# 591928]

The NetScaler appliance does not reduce the received Maximum Segment Size (MSS) to accommodate TCP options (such as timestamps). Therefore, the NIC drops such packets.

[From Build 64.34]

[# 593209]

For a NetScaler appliance with extended memory configured for Large Scale NAT (LSN) feature, after warm rebooting the appliance, when the appliance is added as secondary node to an appliance that does not have the extended memory configured for LSN, the secondary appliance becomes unresponsive.

[From Build 64.34]

[# 593261]

For a NetScaler appliance with extended memory configured for Large Scale NAT (LSN) feature, after warm rebooting the appliance, when the appliance is added as secondary node to an appliance that does not have the extended memory configured for LSN, the secondary appliance becomes unresponsive.

[From Build 63.16]

[# 593261]

If weblog data is sent over a TCP connection that the NetScaler appliance has terminated because of buffer overflow, the appliance fails. With the fix, the connection is checked to ensure that it is not closed before the weblog data is sent.

[From Build 64.34]

[# 593968, 574996]

Some events may be logged twice if DEBUG level is enabled for syslog, by using the "set audit syslogParam" command.

[From Build 64.34]

[# 594485]

A NetScaler appliance does not support Base64 decoded TASS cookie IDs of more than 64 characters. If Security Assertion Markup Language (SAML) or federation results in an ID longer than 64 characters, the appliance does not support the cookie ID.

[From Build 65.35]

[# 594603, 607019, 615811]

When adding a syslog action for which the netProfile parameter is set, the Subnet IP (SNIP) address is used as the source IP address for sending log messages. If the netProfile parameter is not set, the NetScalerIP (NSIP) address is used as the source IP for sending the log messages.

[From Build 64.34]

[# 595449]

An interface based expression might be evaluated incorrectly. In previous releases, evaluation of an interface-based expression was based on the information available in the connection block as well as the information available in the individual frame. Now, only the information in the frame is considered, and this information can change during the course of a transaction.

[From Build 68.10]

[# 597312]

An interface based expression might be evaluated incorrectly. In previous releases, evaluation of an interface-based expression was based on the information available in the connection block as well as the information available in the individual frame. Now, only the information in the frame is considered, and this information can change during the course of a transaction.

[From Build 68.11]

[# 597312]

On a NetScaler VPX appliance provisioned on Microsoft Hyper-V servers, if more than 4 interfaces are assigned to the appliance, the interfaces might get scrambled and appear in a different order in both the NetScaler command line and the NetScaler GUI.

[From Build 67.12]

[# 599122]

If, when establishing an MPTCP connection, a NetScaler appliance receives a duplicate acknowledgment in the 3-way handshake process, the appliance reverts to a normal TCP connection.

[From Build 65.35]

[# 601372]

The "start nstrace" command has a new parameter, -capsslkeys, with which you can capture the SSL master keys for all SSL sessions. If the capsslkeys option is enabled, a file named nstrace.sslkeys is generated along with the packet trace and imported into Wireshark to decrypt the SSL traffic in the trace file.

[From Build 66.11]

[# 603225]

When a NetScaler appliance is integrated with ESP or VPX devices functioning as E100 devices, it encounters buffer-allocation failure and packet-reception failure.

[From Build 65.35]

[# 604971, 611176]

If, when processing a URL, the parser encounters a tag that has "#"as a source attribute, the URL is considered to be empty as # is a fragment identifier. This leads to corrupted values because we continue processing the empty URL.

[From Build 65.35]

[# 605258]

In a wildcard virtual server configuration, a NetScaler appliance dynamically identifies an origin service by opening a probe connection. If the origin responds with a jumbo Maximum Segment Size (MSS), the appliance uses the MSS for future connections with the origin. If the jumbo frame support is disabled, it results in transactions failure.

[From Build 66.11]

[# 605873]

A T1200 appliance that is used in a NetScaler deployment can become unresponsive or fail when generating the NetScaler tech support logs.

[From Build 65.35]

[# 606247, 624369, 624385]

With the default TCP congestion control, a NetScaler appliance recovering from packet loss reduces the congestion window to half its previous length. With multiple packet loss events, the congestion window becomes small and delays transactions.

[From Build 65.35]

[# 606493, 601655, 623185]

You cannot shut down or restart the virtual machine by using the VMware vSphere tool.

[From Build 65.35]

[# 607158]

A warning error message "Error =80000004 in nsagg_process_stat_request, closing connection" displays when a nscollect module requests counter information from a nsagregator daemon at every 5 minute interval. The nsaggregator daemon prints the warning message as response to the request received from nscollect module for more than 256 counters.

Due to a bug in Hard Disk Drive (HDD) monitoring logic, if a message in /var/log/messages matches "*ad* Device not configured" string pattern, it results in producing false positive errors.

[From Build 65.35]

[# 611774, 598774]

Client-based virtual machines are unable to access a NetScaler appliance if they are running on the same server (for example, VPX on Linux KVM). However, they are accessible if they are running on different servers.

[From Build 65.35]

[# 613108]

In a high availability setup, command propagation and configuration synchronization using secure RPC might fail if SSLv3 and TLS1.0 protocols are disabled for SSL internal services.

[From Build 67.12]

[# 613966]

A NetScaler appliance fails when an MPTCP subflow receives an Infinite DSS mapping in a partially retransmitted packet.

[From Build 65.35]

[# 614842, 623426]

A NetScaler appliance fails when it encounters an HTTP/2 connection level error on a TCP connection.

[From Build 65.35]

[# 615395]

Commands entered in the NetScaler CLI or GUI might fail because of a shortage of system resources or failure of system socket connections.

With this fix, the NetScaler appliance attempts to reestablish the socket connections. After the socket connections are established, the appliance runs the failed commands internally.

[From Build 65.35]

[# 615487]

A NetScaler appliance might fail because of a segmentation fault if it receives a large HTTP/2 request Header that evicts the dynamic header table entry.

[From Build 65.35]

[# 615629]

The NetScaler Weblog client intermittently fails because of incorrect indexing, leading to segmentation failure

[From Build 65.35]

[# 615895, 620767]

A NetScaler appliance might become unresponsive if it has a TCP profile with the TCP keepalive option enabled and is bound to a load balancing virtual server. The cause is an interoperability issue between the TCP keepalive and TCP packet retransmission functionalities.

[From Build 69.123]

[# 619349, 626027]

A NetScaler appliance fails when an MPTCP subflow receives an Infinite DSS mapping in a partially retransmitted packet.

[From Build 66.11]

[# 623426]

In a NetScaler appliance, if the Ring Receive buffer is full, the appliance starts to discard data packets at the Network Interface Card (NIC). As a result, the appliance drops packets leading to a probe failure.

[From Build 69.123]

[# 623977, 649735]

After an upgrade, if a partition id is missing in a HTTP abort transaction log record, it results in a NetScaler Web Log (NSWL) utility failure.

[From Build 67.12]

[# 623983]

A NetScaler appliance fails if the Front End Optimization (FEO), Application Firewall, and SSL features are all enabled and the appliance encounters an error while parsing an HTML response.

[From Build 66.11]

[# 624327]

A NetScaler appliance fails on a network interface if it receives retransmitted data for which the maximum transmission unit (MTU) is larger than 1500 bytes.

[From Build 67.12]

[# 625776, 624763, 624779, 629314, 630646, 636283, 637479]

After a reboot, if you increase the Cache memory limit with Front End Optimization (FEO) feature enabled, it leads to a NetScaler appliance failure.

The HTML-injection feature might cause dropped requests, closed connections, and possible failure of the NetScaler appliance. The HTML-injection feature generates a special request for each embedded object, for sending timestamp-related information to the EdgeSight server. The request URL contains the content type of the object. If the Content-Type field in the request contains a space, it should be percent-encoded, but the HTML-injection feature inserts the space as is. Therefore, by HTTP standards, the request is invalid. If the "drop invalid requests" option is enabled in the applicable HTTP profile, the request is dropped and the connection is closed. Also, if the URL spans multiple packets, the NetScaler appliance fails while processing the next packet after the request is marked invalid.

[From Build 70.16]

[# 626848]

A configuration loss occurs when you upgrade Content Switching (CS) entities above the following limits:

Memory allotted to a packet engine 2GB 4GB

Max number of content switching virtual servers 1200 2500

Max number of content switching policies 1500 3500

Max number of content switching virtual server bindings 3000 4000

[From Build 65.35]

[# 628528]

The NetScaler appliance might fail, because of memory corruption, if a policy uses an expression that applies the MATCHES (not MATCHES_LOCATION) function to an IPv4 or an IPv6 address and there is an issue in communicating with the DNS server.

[From Build 68.10]

[# 630782, 630436, 631279, 637396, 650939, 650964]

The NetScaler appliance might fail, because of memory corruption, if a policy uses an expression that applies the MATCHES (not MATCHES_LOCATION) function to an IPv4 or IPv6 address and there is an issue in communicating with the DNS server.

[From Build 68.11]

[# 630782, 630436, 631279, 637396, 650939, 650964]

If NetScaler appliance is setup with Web Log feature and weblog clients are connected then under traffic stress, a buffer overrun can cause the weblog client to reconnect. When the clients reconnect, we lose part of the data on connections where reconnect was triggered and hence log data is not complete.

[From Build 68.11]

[# 633308, 646753, 648657, 656502]

If NetScaler appliance is setup with Web Log feature and weblog clients are connected then under traffic stress, a buffer overrun can cause the weblog client to reconnect. When the clients reconnect, we lose part of the data on connections where reconnect was triggered and hence log data is not complete.

[From Build 69.123]

[# 633308, 646753, 648657, 656502]

Heavy traffic through a NetScaler appliance can result in a web log buffer overrun, causing a NetScaler Web logging (NSWL) client to reconnect. When the client reconnects, the use of surplus connections results in omission of the PCB's user-name information (part of connection related information) during cloning. This leads to a loss of log data.

[From Build 68.10]

[# 633308, 646753, 648657]

If AppFlow feature and client side measurements are enabled, the NetScaler appliance deletes the NSC_ESNS cookie before forwarding the request to the backend server. A rule was rewritten and configured to insert the Pback cookie in the request sent to the backend server. We are corrupting the OutllookSession cookie when we are trying to do both insert and delete in the HTTP request at the same offset. This is causing sign-on problems. This issue is under investigation.

[From Build 71.24]

[# 633371, 682640]

If you use the GUI to access a NetScaler appliance, the appliance sends configuration change SNMP traps, even if there has been no change in the configuration settings.

[From Build 67.12]

[# 634480]

In an HTTP/2 transaction, if a response is sent from the Integrated Caching (IC) module, the transaction might fail because the NetScaler appliance advertises zero window to the client.

[From Build 67.12]

[# 635102]

A NetScaler appliance fails if you enable the Front End Optimization (FEO) feature and the User Agent Request header size exceeds 8 KB.

[From Build 67.12]

[# 636662]

An invalid compressed header in SPDY frames causes a NetScaler appliance to restart.

[From Build 68.11]

[# 637651]

An invalid compressed header in SPDY frames causes a NetScaler appliance to restart.

[From Build 68.10]

[# 637651]

The TCP wait queue counter might be incorrect, because the NetScaler appliance does not update the counter properly during persistence probes.

[From Build 68.11]

[# 637919]

The TCP wait queue counter might be incorrect, because the NetScaler appliance does not update the counter properly during persistence probes.

[From Build 68.10]

[# 637919]

If, in a Multipath TCP (MPTCP) session with a single subflow, the client in the subflow signals a zero-window condition before the subflow connection times out, the NetScaler appliance uses small-window-protection logic to mark the subflow connection as a small-window attack from the client. The logic checks to determine whether the existing number of small window connections exceeds the threshold value (set to 100, by default) and if true, the appliance resets the subflow causing the appliance to fail.

[From Build 67.12]

[# 639081]

The Configd daemon fails if the number of session IDs exceeds the preset limit and existing client sessions are renumbered.

[From Build 69.123]

[# 639380, 657168, 657781]

Enabling both the AppFlow option and the AppQoE option might cause a memory leak, which can degrade performance and eventually cause the appliance to fail.

[From Build 71.24]

[# 640545, 685334, 686832, 687603]

The CPU parameter value on the LCD panel does not match the value reported by the NetScaler CLI or GUI.

[From Build 68.11]

[# 643237]

The CPU parameter value on the LCD panel does not match the value reported by the NetScaler CLI or GUI.

[From Build 68.10]

[# 643237]

The TCP timestamp is now an interoperable parameter for TCP and Multipath TCP (MPTCP) data transmission.

[From Build 69.123]

[# 646496]

If a 10G interface is disabled, the IfInDiscard counter might increase.

When page tracking is enabled on an AppFlow, the NS_ESNS cookie is inserted into the response being served from the cache. The extra bytes added to the response are not accounted internally and therefore when the ACK is received for those extra bytes, NetScaler crashes.

[From Build 69.123]

[# 649334, 653370, 656768, 662177, 663537, 669161]

When page tracking is enabled on an AppFlow, the NS_ESNS cookie is inserted into the response being served from the cache. The extra bytes added to the response are not accounted internally and so, when the ACK is received for those extra bytes, NetScaler crashes.

[From Build 68.11]

[# 649334, 653370, 656768]

If a FASTCLOSE packet from a NetScaler appliance to a client is lost, the multipath TCP (MPTCP) session does not notify the application about the abrupt connection closure and close the socket. As a result, the appliance does not retransmit the lost packet.

[From Build 69.123]

[# 649968]

A NetScaler appliance fails if a TCP/IP session is simultaneously reused for TCP and Multipath TCP (MPTCP) operation and not mutually exclusive with TCP KeepAlive enabled for MPTCP subflows.

[From Build 69.123]

[# 654080]

By default, a NetScaler appliance ignores the non-standard and obsolete "Proxy-Connection" HTTP header. To change this behavior, use the nsamimgr command to set the proxyConnection parameter to 1. This setting prioritizes the Proxy-Connection header over the Connection header.

For example, nsapimgr -ys proxyconnection=1

[From Build 69.123]

[# 654560]

During a TCP transaction, when the client advertises zero window to a NetScaler appliance, the appliance periodically sends zero window probe to ascertain if the client can open the window so that the NetScaler appliance can send in new data. When sending such a probe, the appliance sends a full maximum segment size (MSS) packet during first probe and from the second probe onwards, sends a 1-byte packet. If the client does not open the window after sending such a probe, but instead sends a TCP Reset or if the connection on the NetScaler appliance gets flushed for other reasons, then it may lead to duplicate buffer free on the appliance that might cause the appliance to fail.

During a TCP transaction, when the client advertises zero window to a NetScaler appliance, NetScaler periodically sends zero window probe to ascertain if the client can open the window so that NetScaler can send in new data. When sending such a probe, NetScaler sends a full maximum segment size (MSS) packet during first probe and from the second probe onwards, sends a 1 byte packet. If the client does not open the window after sending such a probe, but instead sends a TCP Reset or if the connection on NetScaler gets flushed for other reasons, then it may lead to duplicate buffer free on NetScaler that may lead the appliance to crash.

Syslog analysis is affected if the date/month format in a syslog message is not a user configured timestamp. This issue occurs if the Syslogaction uses the default date format (MM/DD/YYYY) instead of a user defined data format.

[From Build 69.123]

[# 659197, 656437]

NetScaler appliance crashes when a large host-name header is received and AppFlow logging for host-name and domain-name is enabled.

[From Build 69.123]

[# 660075, 655521, 664886]

An overflow of integers updates the NetScaler memory statistics with a false value. This results in SNMP memory traps not reaching the configured threshold.

[From Build 70.16]

[# 663720, 612313]

If the integrated caching (IC) memory limit is set to a value greater than 4 GB and front end optimization (FEO) is enabled, the NetScaler appliance crashes.

[From Build 71.24]

[# 666208]

The NetScaler command line does not come out of the execution logic and does not display the command prompt when multiple grep with pipe operations are performed.

[From Build 70.16]

[# 667214]

Before processing auditlog, if the auditlog message size and log levels are not validated properly, it leads to an overflow of memory buffer and crashes other modules in a NetScaler appliance.

[From Build 70.16]

[# 670496]

In an SSL connection with a client, the NetScaler appliance does not evaluate the SSL policies for HTTP/2 streams.

After an upgrade, a NetScaler Weblogging (NSWL) HTTP record size is miscalculated if the HTTP header size is greater than 16 kilobytes and it is not a multiple of the word boundary.

[From Build 70.16]

[# 671996, 672244, 678903]

If the session ID maintained for clients exceeds the threshold of 16 million entries, the configuration engine might crash. That affects the management traffic. As a result, the management connection closes and the manager must log back on to the NetScaler appliance.

[From Build 71.24]

[# 676599, 692553]

In a high availability setup, the following command-propagation warning message appears when a backup is created for a large configuration file on the primary node: "Warning: There is no response from secondary. Propagation Timed out” However, creation of the backup file succeeds in both the nodes after some time.

An attempt to configure a NetScaler appliance that uses Cloudstack can cause the appliance to fail. If the Cloudstack AutoScale feature or an AutoScale policy is configured with the IP address a server, an attempt to configure the appliance through the NetScaler CLI instead of through CloudPlatform or Cloudstack binds the IP-address based server to the AutoScale Policy service group. This causes the appliance to crash.

[From Build 71.24]

[# 681426]

If you configure an SNMP trap in the sequence of:

* Adding v2/v1 traps

* Adding v3 traps with bindings

* Removing v2/v1 traps

* Unbinding v3 trap

and if you execute the show SNMP trap command to display the SNMP v3 trap details, the NetScaler appliance fails.

[From Build 71.24]

[# 682161]

A NetScaler appliance might crash, if a particular sequence of white space and CR-LF characters is sent to an HTTP or SSL virtual server instead of a valid HTTP request.

[From Build 71.24]

[# 683512, 699684]

If multiple trap destinations have the same IP address but different SNMP versions, one of which is SNMPv3, modifying an SNMPv3 trap message leads to an appliance failure.

[From Build 71.24]

[# 683622, 683806]

Some packets become invalid and are dropped when policies are applied. If HTTP/2 packets are dropped, the NetScaler appliance fails to send a rst_stream frame to the client, which causes the appliance to crash when new packets arrive.

[From Build 71.24]

[# 684370]

Connections can become unresponsive because of data loss that occurs under the following set of conditions:

* Different traffic domains are configured on the virtual server and the service.

* Data insertion causes the NetScaler appliance to split packets.

[From Build 71.24]

[# 685510]

A NetScaler appliance in a high availability configuration crashes when using TCP transport to send log messages.

[From Build 71.24]

[# 685898]

The NetScaler appliance does not send buffered log messages when the SYSLOG server is ready to accept them.

[From Build 71.24]

[# 686751]

If a NetScaler-inserted cookie is deleted from the end of a cookie header, the appliance does not remove the preceding semicolon. As a result, an extra semicolon is sent at the end of the cookie header when forwarding it to the back-end server.

[From Build 71.24]

[# 687612]

If you force Quick ACK mode by sending Keep Alive probes in the middle of a three-way handshake, it causes the appliance to reset the back-end server connection.

[From Build 71.24]

[# 690047]

A NetScaler appliance might crash with different backtraces if any one of the following conditions is met:

• Memory is freed to wrong pool.

• AppQoE or HTMLInjection feature is enabled.

• AppFlow feature is enabled with clientSideMeasurements option enabled in the AppFlow action.

Telco

After a failover occurs in a high availability configuration, some LSN static maps might become inactive on the new secondary node.

[From Build 63.16]

[# 487318]

In a network setup that includes both dynamic and deterministic types of clients, the first request from a deterministic client is not served if a dynamic client has sent a request.

[From Build 63.16]

[# 576602]

SIP registration might fail, if authentication is enabled in the SIP proxy server.

[From Build 64.34]

[# 579797]

With a large number of active subscribers, and a high traffic rate for SIP over TCP, the NetScaler appliance can fail during ALG processing.

[From Build 65.35]

[# 582464]

In a DS-Lite configuration with a server behind the B4 device, the NetScaler appliance does not properly process FTP packets that have the following set of characteristics:

* Are from clients on the Internet

* Are destined to the server

* Match DS-Lite static NAT maps configured on the NetScaler appliance

[From Build 67.12]

[# 601560]

In a high availability deployment with LSN and DS-Lite configuration, LSN and DS-Lite mappings for active FTP connections are not removed from the secondary node even after they time out or are flushed.

[From Build 65.35]

[# 601920, 619864]

Unified Gateway

The default expression to route Unified Gateway VPN traffic does not include all of the necessary expressions which can cause a Receiver connection failure.

VPX on AWS

In a high availability setup of two NetScaler VPX instances on AWS cloud, interfaces do not get detached from the old primary node and attached to the new primary node after a failover. This issue is caused because the instance ID is not made available to the awsconfig module.

[From Build 67.12]

[# 640933]

Web Interface on NetScaler (WIonNS)

After upgrading to nswi-1.8.tgz, existing WI sites are not accessible till you remove the sites and then add them back.

[From Build 62.10]

[# 576883]

WIonNS v1.7 does not work when WebFront is installed.

[From Build 63.16]

[# 577988]

Release history

For details of a specific release, see the corresponding release notes.